ML20151K594
| ML20151K594 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 04/14/1988 |
| From: | Wagner D Office of Nuclear Reactor Regulation |
| To: | Fay C WISCONSIN ELECTRIC POWER CO. |
| References | |
| TAC-67083, TAC-67084, NUDOCS 8804210356 | |
| Download: ML20151K594 (3) | |
Text
c April 14, 1988 Docket Nos. 50-266 D!STRIBUTION:_
and 50-301 Doctet nles A NRC & L9 cal PDRs PDIII-3 r/f KPerkirs GHolahan PKreutter DWagner 0GC-WF1 Mr. C. W. Fay, Vice President EJordan JPartlow Nuclear Power Department ACRS(10)
PDIII-3 Gray File Wisconsin Electric Power Company 231 W. Michigan Street, Room 308 Milwaukee, Wisconsin 53201
Dear Mr. Fay:
SUBJECT:
INSERVICE INSPECTION RELIEF FOR SECOND 10-YEAR INSPECTION INTERVAL - REACTOR COOLANT PUMP CASINGS (TACS 67083 AND 67084)
By letter dated January 25, 1988, you requested relief from an ASME Section XI code requirement you determined to be impractical to perform during the second 10-year inspection interval at Point Beach Nuclear Plant, Units 1 and 2 (PBNP).
Examination Category B-L-1 and Category B-L-2 inspections are required on the redctor coolant pump casings.
You proposed alternative examinations as follows:
(a) A visual (VT-2) examination of the casing exterior will be performed in corjunction with the system leakage test every outage and each systern hydrostatic test.
(b) Once each interval, an exterior surface examination of approximately i
one-third of the accessible pump casing weld surface will be conducted in conjunction with a 100% exterior visual examination (VT-1).
(c)
If maintenance or operational problems are encountered which necessitate disassembly of the casing internals of either pump, a VT-3 examination of tk Sterior casing surface will be performed.
(d) Vibration monitors are currently installed on the motor frame near the lower radial bearing and on the motor shaf t above the pump casing.
These monitors will alarm on panel C04 in the control room if either detects high vibration. The PBNP Operating Procedures Manual provides reactor coolant pump (RCP) vibration limits.
If the limits are exceeded, you would expect to shut down and determine the cause. These monitors would most likely detect any problem which could lead to pump casing, welds, or rotating element failure.
We have performed a preliminary review of the relief requests for both Point Beach units, and we have a number of correents which you should consider.
8804210356 080414 PDR ADOCK 05000266 P
Mr. C. W. Fay In Item (c), above, you commit to perform a VT-3 visual examination of the interior pump casing surface if the pump is disassembled.
In the event that a pump is not disassembled, this connitment should extend past the end of the inspection interval.
If a pump is disassembled in the future to the ext nt that a radiographic examination is practical and a miniature linear acceierator (MINAC) is available, the staff expects that the code-required volumetric examination would be performed.
Secondly, if you were to commit to perform the code-required examination as discussed above, the exterior surface examination discussed in Item (b) above would not be necessary.
Each pump casing is fabricated by welding four stainless steel (SA 351 CF8) castings together. Your submittal states that the physical properties of the stainless steel castings and weld material prevent meaningful ultrasonic examination. The staff agrees that the examination of thick stainless steel castings may be extremely difficult, especially when the scanning surface is not prepared for examination. The staff considers the demonstrated impracti-cality to perform ultrasonic testing to be plant specific. You should describe any attempts to perform ultrasonic testing of the pump casings at Point Beach to substantiate your statement that the physical properties of the pump casings prevent meaningful ultrasonic examinations.
We suggest that you consider these comments and revise your proposed relief request accordingly, 1
Sincerely.
/s/
David H. Wagner, Project Manager Project Directorate III-3 Division of Reactor Projects - III, IV, V and Special Projects cc:
See next page l
f
- SEE PREVIOUS CONCURRENCE Office:
LA/PDIII-3 PM/PDIII-3 EMTB PD/PDIII-3 i
Surname: *PKreutzer
- DWagner/tg
- CYCheng
- KPerkins Date:
04/14/88 04/14/88 04/13/88 04/14/88
Mr. C. W. Fay Point Beach Nuclear Plant Wisconsin Electric Power Company Units 1 and 2 cc:
Mr. Bruce Churchill, Esq.
Shaw, Pittman, Potts and Trowbridge 2300 N Street, N.W.
Washington, DC 20037 l
Mr. James J. Zach, Manager Point Beach Nuclear Plant Wisconsin Electric Power Company 6610 Nuclear Road Two Rivers, Wisconsin 54241 Town Chairman Town of Two Creeks Route 3 Two Rivers, Wisconsin 54241 Chairman Public Service Commission of Wisconsin Hills Farms State Office Building Madison, Wisconsin 53702 Regional Administrator, Region III U.S. Nuclear Regulatory Conmission Office of Executive Director for Operations 799 Roosevelt Road i
Glen Ellyn, Illinois 60137 Resident Inspector's Office U.S. Nuclear Regulatory Conmission 6612 Nuclear Road Two Rivers, Wisconsin 54241 l
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