Ultrasonic detection test block and detection method for upper end socket nozzle of pressure stabilizer

Abstract

The invention discloses a pressure stabilizer upper end socket nozzle ultrasonic detection test block and detection method, the detection test block comprises a TCG curve reference test block, the TCG curve reference test block comprises a body, a first surfacing layer and a simulation notch groove part; the inner fillet simulation body test block comprises a pipe body, a second surfacing layer and a crescent groove part; according to the invention, the first surfacing layer and the simulated notch groove part are processed on the outer surface of the TCG curve reference test block, so that the shape of the outer surface of the inner fillet area of the nozzle of the upper sealing head of the voltage stabilizer can be effectively simulated, the coupling state of the ultrasonic probe is tested, and the ultrasonic inspection result is more reliable; a second surfacing layer is processed on the inner surface of the inner fillet simulation body test block, so that the form of the inner surface of the inner fillet area of the upper end socket nozzle of the voltage stabilizer can be effectively simulated, the sound beam covering effect of an ultrasonic probe is tested, and the ultrasonic inspection result is more reliable; by processing a crescent groove part in the inner fillet simulation body test block, ultrasonic time-gain correction of a TCG curve and scanning sensitivity calibration can be effectively carried out.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power, and in particular to an ultrasonic testing block and a testing method for a nozzle on a pressurizer head. Background Art

[0002] The nozzle of the upper head of the pressurizer is connected to the cylinder of the container by a pipe seat. The inner fillet is an internal transition structure. The material is low-alloy steel and the inside is covered with a stainless steel cladding layer. Due to the particularity of this part, cracks will occur under the cladding layer, so ultrasonic testing can be used for inspection during the in-service inspection of nuclear power plants. During ultrasonic testing, since it is impossible to approach the inside, the inspection must be performed from the outside of the container, but due to its complex saddle surface geometry and the arc state of the outer surface, these have caused difficulties for ultrasonic testing. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an ultrasonic detection test block and a detection method for a nozzle on a stabilizer head.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a test block for ultrasonic detection of the nozzle of the upper end cap of a pressurizer, comprising:

[0005] A TCG curve reference test block is used for the morphology of the outer surface of the inner fillet area of ​​the nozzle of the nuclear power plant pressurizer. The TCG curve reference test block for testing the coupling state of the ultrasonic probe comprises a body, a first cladding layer and a simulated groove portion; the first cladding layer is arranged on the body, and the simulated groove portion is arranged on the first cladding layer and the body;

[0006] Or / and, an inner fillet simulation body test block is used to simulate the morphology of the inner surface of the inner fillet area of ​​the upper head nozzle of a nuclear power plant stabilizer. The inner fillet simulation body test block for testing the coverage effect of the ultrasonic probe sound beam includes a tube body, a second weld overlay layer, and a crescent groove portion for performing ultrasonic time-gain correction TCG curve and scanning sensitivity calibration; the second weld overlay layer is sleeved in the tube body, and the crescent groove portion is arranged on the second weld overlay layer and the tube body.

[0007] Furthermore, in the ultrasonic testing block for the upper end cap nozzle of the pressurizer, the simulated groove portion preferably includes a first groove, a second groove, a third groove and an arc groove;

[0008] The first groove, the second groove and the third groove are all formed through the first surfacing layer and extend to the main body, and the arc groove is formed on the upper surface of the main body and the first surfacing layer.

[0009] Furthermore, in the ultrasonic inspection test block for the upper end nozzle of the pressurizer, preferably, the first cladding layer includes a left welding layer and a right welding layer respectively arranged on two opposite sides of the body;

[0010] The first groove and the second groove are both formed through the left solder layer and extend to the main body;

[0011] The third groove is formed through the right welding layer and extends to the main body.

[0012] Furthermore, in the ultrasonic inspection test block for the upper head nozzle of the regulator, the crescent groove portion preferably includes a first crescent groove, a second crescent groove and a third crescent groove which penetrate through the second weld overlay layer and extend to the tube body.

[0013] Furthermore, in the ultrasonic inspection test block for the upper head nozzle of the regulator, the first crescent groove is preferably arranged opposite to the third crescent groove, and the second crescent groove is arranged at a position where the first crescent groove is rotated ninety degrees from the center axis of the tube body.

[0014] Furthermore, in the ultrasonic testing block for the nozzle of the upper end cap of the pressurizer, the tube body preferably comprises an inner fillet straight tube portion, an inner fillet corner portion and an inner fillet end portion which are connected in sequence;

[0015] The second cladding layer comprises a cladding layer straight pipe portion, a cladding layer corner portion and a cladding layer end portion which are connected in sequence;

[0016] The inner rounded straight tube portion, the inner rounded corner portion and the inner rounded end portion are respectively sleeved outside the surfacing layer straight tube portion, the surfacing layer corner portion and the surfacing layer end portion.

[0017] Furthermore, in the ultrasonic inspection test block for the upper head nozzle of the regulator, preferably, the first crescent groove, the second crescent groove and the third crescent groove are respectively opened through the straight tube portion of the weld overlay layer, the corner portion of the weld overlay layer and the end portion of the weld overlay layer and extend to the inner fillet straight tube portion, the inner fillet corner portion and the inner fillet end portion.

[0018] Furthermore, in the ultrasonic inspection test block for the upper head nozzle of the stabilizer, the angle between the center line of the first groove and the center line of the second groove is preferably °.

[0019] Furthermore, in the ultrasonic inspection test block for the upper head nozzle of the pressurizer, preferably, the first groove, the second groove and the third groove respectively include at least one groove body.

[0020] A method for detecting an ultrasonic testing block of a nozzle on a pressurizer head, comprising the following steps: S1, after the ultrasonic probe has calibrated the time base information, the probe is placed on the arc groove of the TCG curve reference test block;

[0021] S2, moving the ultrasonic probe to find the highest echo amplitude of the signal in the first groove, the second groove and the third groove, adjusting the instrument gain so that the signal is at %±% of the full screen height of the instrument, and recording the adjusted gain value;

[0022] S3, keeping the instrument settings unchanged, finding the signal echoes other than the highest signal in the first groove, the second groove and the third groove, and adjusting their heights to %±% of the full screen height of the instrument, and recording the adjusted gain values;

[0023] S4, taking the horizontal axis as the depth of the first groove, the second groove and the third groove, connecting each point in sequence to generate a TCG curve;

[0024] S5, using the first lunula, the second lunula, and the third lunula of the fillet simulation body test block to verify the sensitivity of the TCG curve.

[0025] The implementation of the present invention has the following beneficial effects: by processing the first cladding layer and the simulated groove portion on the outer surface of the TCG curve reference test block, the morphology of the outer surface of the inner fillet area of ​​the upper head nozzle of the regulator can be effectively simulated, the coupling state of the ultrasonic probe can be tested, and the ultrasonic inspection result can be made more reliable; by processing the second cladding layer on the inner surface of the inner fillet area of ​​the upper head nozzle of the regulator, the morphology of the inner surface of the inner fillet area can be effectively simulated, the ultrasonic probe sound beam coverage effect can be tested, and the ultrasonic inspection result can be made more reliable; by processing the crescent groove portion in the inner fillet simulation body test block, the ultrasonic time-gain correction TCG curve and scanning sensitivity calibration can be effectively performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0027] Figure 1 3D schematic diagram of a TCG curve reference test block of a pressurizer upper head nozzle ultrasonic inspection test block in some embodiments of the present invention;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the inner fillet simulation body test block of the ultrasonic inspection test block of the upper head nozzle of the stabilizer in some embodiments of the present invention;

[0029] Figure 3 yes Figure 1 The three-dimensional decomposition structure diagram of the TCG curve reference test block shown;

[0030] Figure 4 yes Figure 2 The three-dimensional cross-sectional structure diagram of the fillet simulation body test block shown;

[0031] Figure 5 yes Figure 2 Schematic diagram of the three-dimensional exploded structure of the filleted corner simulation body test block shown.

[0032] Explanation of the symbols in the schematic diagram:

[0033] 10. TCG curve reference test block;

[0034] 11. Ontology;

[0035] 12, first cladding layer; 121, left cladding layer; 122, right cladding layer;

[0036] 13, simulated groove portion; 131, first groove; 132, second groove; 133, third groove; 134, arc groove;

[0037] 20. Fillet simulation body test block;

[0038] 21. tube body; 211. inner fillet straight tube portion; 212. inner fillet corner portion; 213. inner fillet end portion;

[0039] 22, second cladding layer; 221, straight pipe portion of cladding layer; 222, corner portion of cladding layer; 223, end portion of cladding layer;

[0040] 23. Alveolar part; 231. First alveolar part; 232. Second alveolar part; 233. Third alveolar part. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0042] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0043] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0044] The technical solution adopted by the present invention to solve its technical problem is:

[0045] like Figure 1 to Figure 2 As shown, some embodiments of the present invention disclose an ultrasonic inspection test block and inspection method for a pressurizer upper end nozzle, which may include a TCG curve reference test block 10 and an inner fillet simulation body test block 20 in some embodiments. The TCG curve reference test block 10 may include a body 11, a first weld overlay layer 12, and a simulated groove portion 13 in some embodiments. The first weld overlay layer 12 is disposed on the body 11, and the simulated groove portion 13 is disposed on the first weld overlay layer 12 and the body 11. It can be understood that by machining the simulated groove portion 13 on the outer surface of the TCG curve reference test block 10, the morphology of the outer surface of the inner fillet area of ​​the pressurizer upper end nozzle can be effectively simulated, the coupling state of the ultrasonic probe can be tested, and the ultrasonic inspection result can be made more reliable.

[0046] like Figure 3As shown, in some embodiments, the fillet simulation body test block 20 may include a tube body 21, a second cladding layer 22, and a crescent groove 23. The second cladding layer 22 is sleeved in the tube body 21, and the crescent groove 23 is arranged on the second cladding layer 22 and the tube body 21. It can be understood that by processing the second cladding layer 22, the slope, the inner bend angle and other structures on the inner surface of the fillet simulation body test block 20, the morphology of the inner surface of the fillet area of ​​the upper head nozzle of the stabilizer can be effectively simulated, the ultrasonic probe sound beam coverage effect can be tested, and the ultrasonic inspection result can be made more reliable; by processing the crescent groove 23 in the fillet simulation body test block 20, the ultrasonic time-gain correction TCG curve and the scanning sensitivity calibration can be effectively performed.

[0047] Continue to refer Figure 2 In some embodiments, the first weld overlay layer 12 may include a left weld layer 121 and a right weld layer 122 respectively arranged on two opposite sides of the body 11. It can be understood that the body 11 is a trapezoidal block structure to facilitate the shape of the outer surface of the inner fillet area of ​​the head nozzle on the stabilizer. The left weld layer 121 and the right weld layer 122 are respectively arranged on the left and right sides of the body 11, and the left weld layer 121 and the right weld layer 122 are a 5mm stainless steel weld overlay layer. In some embodiments, the left weld layer 121 and the right weld layer 122 are welded to the body 11. Of course, in other embodiments, the left weld layer 121 and the right weld layer 122 can be connected to the body 11 by bonding, clamping, etc.

[0048] For reference Figure 1 In some embodiments, the simulated groove portion 13 may include a first groove 131, a second groove 132, a third groove 133 and an arc groove 134. The first groove 131 and the second groove 132 are formed through the left welding layer 121 and extend to the body 11, and the third groove 133 is formed through the right welding layer 122 and extends to the body 11. The arc groove 134 is formed on the upper surfaces of the left welding layer 121, the body 11 and the right welding layer 122. It can be understood that the first groove 131, the second groove 132 and the third groove 133 are used to simulate the range of the inner fillet detection. The arc groove 134 is used to simulate the contact surface of the ultrasonic probe.

[0049] In some embodiments, the center line of the first groove 131 and the center line of the second groove 132 are at an angle of 29°. Of course, in other embodiments, the center line angle of the first groove 131 and the second groove 132 can also be changed according to actual needs. In some embodiments, the first groove 131, the second groove 132 and the third groove 133 include at least one groove body. It can be understood that the first groove 131, the second groove 132 and the third groove 133 include three groove bodies in an evenly spaced array, and the groove body is 25.4 mm long and 7.3 mm deep (including the left welding layer 121 and the right welding layer 122). Of course, in other embodiments, the length and depth of the groove body can be set according to actual needs.

[0050] The radius of the arc groove 134 in some embodiments is 95mm, simulating the contact surface of the ultrasonic probe. It can be understood that the arc groove 134 is concave and opened on the upper surface of the left welding layer 121, the main body 11 and the right welding layer 122. In other words, the arc groove 134 is a semicircular structure, which is used to simulate the contact surface of the ultrasonic probe. In other embodiments, the radius of the arc groove 134 can be set according to actual needs (for example, R75mm-R80mm). By machining structures such as the arc groove 134 on the outer surface of the TCG curve reference test block 10, the morphology of the outer surface of the inner fillet area of ​​the upper head nozzle of the stabilizer can be effectively simulated, the coupling state of the ultrasonic probe can be tested, and the ultrasonic inspection results can be made more reliable.

[0051] like Figure 4 and Figure 5 As shown, in some embodiments, the tube body 21 may include an inner fillet straight tube portion 211, an inner fillet corner portion 212, and an inner fillet end portion 213. The inner fillet straight tube portion 211, the inner fillet corner portion 212, and the inner fillet end portion 213 are sequentially connected to each other. The second surfacing layer 22 includes a surfacing layer straight tube portion 221, a surfacing layer corner portion 222, and a surfacing layer end portion 223 that are sequentially connected. The inner fillet straight tube portion 211, the inner fillet corner portion 212, and the inner fillet end portion 213 are sleeved on the outside of the surfacing layer straight tube portion 221, the surfacing layer corner portion 222, and the surfacing layer end portion 223. It can be understood that the inner fillet straight tube portion 211, the inner fillet corner portion 212, and the inner fillet end portion 213 are attached to the outside of the surfacing layer straight tube portion 221, the surfacing layer corner portion 222, and the surfacing layer end portion 223. The inner fillet straight tube portion 211 and the cladding layer straight tube portion 221 are both arranged longitudinally; the inner fillet corner portion 212 and the inner fillet end portion 213 are combined together to form an eight-shaped structure connected to the bottom of the inner fillet straight tube portion 211; the cladding layer corner portion 222 and the cladding layer end portion 223 are combined together to form an eight-shaped structure connected to the bottom of the back-welding layer straight tube portion 221. The inner fillet corner portion 212 and the cladding layer corner portion 222 are rounded structures to simulate the contact surface of the ultrasonic probe. By processing the second cladding layer 22, slopes, inner bends and other structures on the inner surface of the inner fillet simulation reference test block 20, the morphology of the inner surface of the inner fillet area of ​​the upper head nozzle of the stabilizer can be effectively simulated, the ultrasonic probe sound beam coverage effect can be tested, and the ultrasonic inspection results can be made more reliable.

[0052] In some embodiments, the outer diameter of the inner rounded straight tube portion 211 is 979 mm, the inner diameter of the inner rounded corner portion 212 is 95 mm, the radius of the cladding layer straight tube portion 221 is 189.8 mm, and the inner surface of the cladding layer corner portion 222 is R75 mm-R80 mm. Of course, in other embodiments, the dimensions can also be set according to actual needs.

[0053] Continue to refer Figure 4In some embodiments, the crescent groove portion 23 may include a first crescent groove 231, a second crescent groove 232 and a third crescent groove 233, and the first crescent groove 231, the second crescent groove 232 and the third crescent groove 233 are respectively opened in the surfacing layer straight tube portion 221, the surfacing layer corner portion 222 and the surfacing layer end portion 223 and extend to the inner fillet straight tube portion 211, the inner fillet corner portion 212 and the inner fillet end portion 213. In some embodiments, the thickness of the second surfacing layer 22 is a 5mm stainless steel surfacing layer. The radius of the first crescent groove 231, the second crescent groove 232 and the third crescent groove 233 is 19.1mm, and the depth is 7.3mm. It can be understood that since the processing depth exceeds 5mm, the first crescent groove 231, the second crescent groove 232 and the third crescent groove 233 are also 2.3mm processed and opened on the inner wall of the tube body 21.

[0054] In some embodiments, the first crescent groove 231 and the third crescent groove 233 are arranged opposite to each other, and the first crescent groove 231, the second crescent groove 232 and the third crescent groove 233 are staggered. The second crescent groove 232 is arranged at the position where the first crescent groove 231 is rotated 90 degrees from the central axis of the tube body 21. It can be understood that the first crescent groove 231 is arranged on the inner fillet straight tube portion 211, and this position is defined as 0 degrees; the second crescent groove 232 is arranged on the inner fillet corner portion 221, and the second crescent groove 232 is rotated 90 degrees from the first crescent groove 231 along the central axis of the tube body 21 as the center of the circle; the third crescent groove 233 is arranged on the inner fillet end portion 223, and the third crescent groove 233 is rotated 180 degrees from the first crescent groove 231 along the central axis of the tube body 21 as the center of the circle. Of course, in other embodiments, it can also be set according to actual needs. By machining the first crescent groove 231 , the second crescent groove 232 and the third crescent groove 233 in the test block, the ultrasonic time-gain correction TCG curve and the scanning sensitivity calibration can be effectively performed.

[0055] A method for detecting an ultrasonic testing block of a nozzle on a pressurizer head, comprising the following steps: S1, after the ultrasonic probe has calibrated the time base information, the probe is placed on the arc groove 134 of the TCG curve reference test block 10;

[0056] S2, move the ultrasonic probe to find the highest echo amplitude of the signal in the first groove 131, the second groove 132 and the third groove 133, adjust the instrument gain so that the signal is at 80%±5% of the full screen height of the instrument, and record the adjusted gain value;

[0057] S3, keeping the instrument settings unchanged, find the signal echoes other than the highest signal in the first groove 131, the second groove 132 and the third groove 133, and adjust their heights to 80%±5% of the full screen height of the instrument, and record the adjusted gain value;

[0058] S4, taking the horizontal coordinate as the depth of the first groove 131, the second groove 132 and the third groove 133, connecting each point in sequence to make a TCG curve;

[0059] S5 , using the first crescent groove 231 , the second crescent groove 232 , and the third crescent groove 233 of the fillet simulated body test block 20 to verify the sensitivity of the TCG curve.

[0060] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A test block for ultrasonic testing of the nozzle of the upper end of a pressurizer, characterized in that: include: A TCG curve reference test block (10) is used for testing the outer surface morphology of the inner fillet area of ​​the nozzle of a nuclear power plant pressurizer. The TCG curve reference test block (10) for testing the coupling state of an ultrasonic probe comprises a body (11), a first cladding layer (12) and a simulated groove portion (13); the first cladding layer (12) is arranged on the body (11), and the simulated groove portion (13) is arranged on the first cladding layer (12) and the body (11); Or / and, an inner fillet simulation body test block (20) is used to simulate the shape of the inner surface of the inner fillet area of ​​the upper head nozzle of a nuclear power plant stabilizer, and the inner fillet simulation body test block (20) for testing the sound beam coverage effect of an ultrasonic probe comprises a tube body (21), a second cladding layer (22), and a crescent groove portion (23) for performing ultrasonic time-gain correction TCG curve and scanning sensitivity calibration; the second cladding layer (22) is sleeved inside the tube body (21), and the crescent groove portion (23) is arranged on the second cladding layer (22) and the tube body (21).

2. The ultrasonic testing block for the nozzle of the pressurizer upper head according to claim 1 is characterized in that: The simulated groove portion (13) comprises a first groove (131), a second groove (132), a third groove (133) and an arc groove (134); The first groove (131), the second groove (132) and the third groove (133) are all formed through the first cladding layer (12) and extend to the main body (11), and the arc groove (134) is formed on the upper surfaces of the main body (11) and the first cladding layer (12).

3. The ultrasonic testing block for the nozzle of the pressurizer upper head according to claim 2 is characterized in that: The first cladding layer (12) comprises a left welding layer (121) and a right welding layer (122) respectively arranged on two opposite sides of the body (11); The first groove (131) and the second groove (132) are both formed through the left welding layer (121) and extend to the main body (11); The third groove (133) is formed through the right welding layer (122) and extends to the main body (11).

4. The ultrasonic testing block for the nozzle of the pressurizer upper head according to claim 1 is characterized in that: The crescent groove portion (23) comprises a first crescent groove (231), a second crescent groove (232) and a third crescent groove (233) which penetrate through the second cladding layer (22) and extend to the tube body (21).

5. The ultrasonic testing block for the nozzle of the pressurizer upper head according to claim 4 is characterized in that: The first crescent groove (231) is arranged opposite to the third crescent groove (233), and the second crescent groove (232) is arranged at a position where the first crescent groove (231) is rotated 90 degrees with respect to the central axis of the tube body (21).

6. The ultrasonic testing block for the nozzle of the upper end cap of the pressurizer according to claim 4, characterized in that: The tube body (21) comprises an inner rounded straight tube portion (211), an inner rounded corner portion (212) and an inner rounded end portion (213) which are connected in sequence; The second cladding layer (22) comprises a cladding layer straight pipe portion (221), a cladding layer corner portion (222) and a cladding layer end portion (223) which are connected in sequence; The inner rounded straight tube portion (211), the inner rounded corner portion (212), and the inner rounded end portion (213) are respectively sleeved outside the surfacing layer straight tube portion (221), the surfacing layer corner portion (222), and the surfacing layer end portion (223).

7. The ultrasonic testing block for the nozzle of the pressurizer upper head according to claim 6 is characterized in that: The first crescent groove (231), the second crescent groove (232) and the third crescent groove (233) are respectively penetrated through the cladding layer straight tube portion (221), the cladding layer corner portion (222) and the cladding layer end portion (223) and extend to the inner fillet straight tube portion (211), the inner fillet corner portion (212) and the inner fillet end portion (213).

8. The ultrasonic testing block for the nozzle of the pressurizer upper head according to claim 2 is characterized in that: The included angle between the center line of the first groove (131) and the center line of the second groove (132) is 29°.

9. The ultrasonic testing block for the nozzle of the upper end cap of the pressurizer according to claim 2, characterized in that: The first groove (131), the second groove (132) and the third groove (133) respectively include at least one groove body.

10. A method for testing an ultrasonic testing block for a pressurizer upper end nozzle, according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, after the ultrasonic probe has been calibrated for time base information, the probe is placed on the arc groove (134) of the TCG curve reference test block (10); S2, moving the ultrasonic probe to find the highest echo amplitude of the signal in the first groove (131), the second groove (132) and the third groove (133), adjusting the instrument gain so that the signal is at 80%±5% of the full screen height of the instrument, and recording the adjusted gain value; S3, keeping the instrument settings unchanged, finding the signal echoes other than the highest signal in the first groove (131), the second groove (132) and the third groove (133), and adjusting their heights to 80%±5% of the full screen height of the instrument, and recording the adjusted gain values; S4, taking the horizontal coordinates as the depths of the first groove (131), the second groove (132) and the third groove (133), connecting the points in sequence to generate a TCG curve; S5, using the first crescent (231), the second crescent (232), and the third crescent (233) of the fillet simulated body test block (20) to verify the sensitivity of the TCG curve.

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