ML20009D817
| ML20009D817 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 07/01/1981 |
| From: | Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 063A, 63A, IEB-81-01, IEB-81-1, NUDOCS 8107240376 | |
| Download: ML20009D817 (3) | |
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VIRGINIA ELEC'rRIC AND Powns COMPANY RicnxoNn, VinoINIA 23nG1
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July 1, 1981 R.H.LEASBUBO Vacs PassrossT Noca.maB Orsaarrons Mr. James P. O'Reilly, Director Serial No. 063A Office of Inspection and Endorcement N0/DCW:am U. S. Nuclear Regulatory Commission Docket No. 50-281 Region II License
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Dear Mr.~O'Reilly:
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JUL 2 31981
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IE BULLETIN NO. 81-01 u.s. g(8,gou SURVEILLANCE OF MECHANICAL SIMbBERS
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As stated in our letter of March 26, 1981 in respons t
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81-01 concerning surveillance of mechanical snubbers, we have completed the visual inspection and stroke testing of all Surry, Unit 2, mechanical snubbers in accordance with the requirements of the bulletin.
The visual examination, which was performed with Periodic Testing procedures 2-PT-39A and 2-PT-39A-2, included an inspection of the snubber and snubber mounting to ensure the following conditions were met; a.
the snubber was not "hard-up,"
b.
the snubber was not fully extended or fully compressed, c.
the snubber was not in contact. with structures or equipment except at connecting points, d.
the clamp bands and struts are in-line with the snubber axis, e.
the pins for each snubber were inserted, f.
the cotters pins and o-rings for each snubber were in place, g.
the welds for the snubber and the mounts were intact, h.
the connecting structure was not bent or cracked, 1.
and, the snubber rotateci freely around its spherical rod end bearing.
The stroke test, which was parformed with Special Test 127, consisted of; a.
Removing the pin from the cylinder end plug spherical bearing, b.
Compressing and extending the telescoping cylinder over the range of stroke by hand,
%N c.
Returning the snubber to its original position and replacing s
all pins, washers and cotter pins.
Twenty-five (25) mechanical snubbers, 100% for Unit 2, were examined and tested. A list of these snubbers is attached for your review.
One snubber could not be stroked as required by the Special Test.
This snubber was easily removed from its mounting indicating that no undue stress was imposed on the particular pipe in the cold conditiott.
The piping system was re-analysed with the snubber hypothetically considered " locked-up."
8107240376 810703
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VINGINIA Es.zCTRIC AND Powra COMPANY TO The results of this re-analysis revealed that the pipe would not have been overstressed in the hot condition.
The snubber was replaced with a new, functionally tested, snubber prior to resuming operation of the unit.
Another snubber passed the stroke test but did not stroke as easily as designed.
This snubber was also replaced with a new, functionally tested, snubber prior to resuming operation of the unit.
We had planned to disassemble the snubbers that were removed to determine the cause of the binding or reluctance to stroke, but before the snubbers could be removed from the containcent they were inadvertantly discarded during the clean-up operation.
The mechanical snubbers in Unit 1 are presently being tabulated and will be visually inspected and stroke tested prior to unit startup. A report shall follow as required by the bulletin.
If you have any further questions please contact us.
Very truly yours, R. H. Leasburg Vice President - Nuclear Operations Attachment cc: Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing Mr. Robert A. Clark, Chief Operating React 1rs Branch No. 3 Division of Licensing Director, Office of Inspection and Enforcema-*
U. S. Nuclear Regulatory Comtission Washington, D. C.
20555 r
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Attachment UNIT 2 MECHANICAL SNUBBERS 4
MARK NO.
MANUFACTURER MODEL NO.
LOAD STROKE 2-PS-MSS-1A Pacific Scientific Company PSA-1 1500 lbs. 4 in.
2-PS-MSS-2A Pacific Scientific Company PSA-k 350 lbs. 4 in.
2-PS-MSS-14A Pacific Scientific Company PSA-k 350 lbs. 4 in.
2-PS-MSS-1B Pacific Scientific Company PSA-1 1500 lbs. 4 in.
2-PS-MSS-2B Pacific Scientific Company PSA-k 350 lbs. 4 in.
2-PS-MSS-15B Pacific Scientific Company PSA k 350 lbs. 4 in.
2-PS-MSS-16B Pacific Scientific Company PSA-k 350 lbs. 4 in.
2-PS-MSS-1C Pacific Scientific Company PSA-1 1500 lbs. 4 in.
2-PS-MSS-2C Pacific Scientific Compan3 PSA-1 1500 lbs. 4 in.
2-PS-MSS-15C Pacific Scientific Company PSA-k 350 lbs. 4 in.
2-RC-MSS-1 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
2-RC-MSS-2 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
2-RC-MSS-3 Pacific Scientific Company PSA-650 lbs.
2.5 in.
2-RC-MSS-4 Pacific Scientific Company PSA-650 lbs.
2.5 in.
2-RH-MSS-1 Pacific Scientific Company PSA-k 350 lbs. 4 in.
2-SW-MSS-1 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
2-CH-MSS-1 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
2-CH-MSS-2 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
l 2-RH-MSS-2 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
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2-SHP-MSS-1 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
2-SHP-MSS-2 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
2-SHP-MSS-3 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
2-SHP-MSS-4 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
2-SHP-MSS-5 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
2-SHP-MSS-6 Pacific Scientific Company PSA-3 6000 lbs. 5 in.
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