ML20058G249
| ML20058G249 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/23/1982 |
| From: | Parker W DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8208030242 | |
| Download: ML20058G249 (3) | |
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W)LLIAM O, PAR M E R, J R.
s[% E.'o'o'u*e'",1 July 23, 1982
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Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re:
Catawba Nuclear Station Units 1 and 2 Docket Hos. 50-413 and -414
Dear Mr. O'Reilly:
Pursuant to 10 CFR 50.55e, please find attached Significant Deficiency Report SD 413-414/82-14.
Ver truly yours,
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William 0. Parker, Jr.
RWO/php Attachment cc:
Director Mr. Robert Guild, Esq.
Office of Inspection & Enforcement Attorney-at-Law U. S. Nuclear Regulatory Commission 314 Pall Mall Washington, D. C. 20555 Columbia, South Carolina 29201 Mr. P. K. Van Doorn Palmetto Alliance NRC Resident Inspector 2135b Devine Street Catawba Nuclear Station Columbia, South Carolina 29205 1
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CATAW'BkNUCLEARSTATION e
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- REPORT NUMBER: SD4I3-414/82-l4
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REPORT DATE:
July 23, 193?s
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FACILITY: Catawba' NuclearMtatidn, Units 1 & 2 c
s IDENTIFICATION 0F DEFICIENCY:
Capicrews thaE secdrelthe's' tarting air vatve 'and housing assembly to the cylinder head may " bottom out" priorxto properly seating the valve and s
housing assemblp in place. Thejimproqer, seat'may cause a " scouring" or
" burning away" of.the starting air valve and housing.
If this condition occurred on at Irast one cylinder per bank, simultaneously, it is felt second time reqyim(not'be able to start and accept a load within the 11 the diesels would ment.
INITIAL REPORT:
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On June 28,1982, Sr.
A. Julic of NRC Region II, Atlanta, Georgia was notiffed of the deficiency by'Mr./W. O. Henry, Mr. J. P. Voglewede, Mr. J. M.
Lines,4 and Mr. C. C. Rolfe of Duke Power Company, Char \\ otte, NC 28242. This.
l notification was t n response rl0 Mr. R.'A. Pratt's (Trcr sad' erica Delaval).
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a letter dated June;8,1982 to Mill PoweM Supply Company.
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SUThLIER AND/0R COMDONENT: \\
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Transamerica Delaval Incorporated of Oakland, California, manufactured the,
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seirtin') air valves and housing assemblies that are installed.oothe 4
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Catawba diescis.for Units 1 & 2.
The diesels are designated 1 A, I?, 2A,
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DESCRIPTION OF DEFICIENCY:
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Capscrews, M*- in length, were provided by Transainerica,Ddavilho 'sec{ure the
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i startir. fair va%e and va'ive housing in the cylinder head.\\ With the 3",long capscrews, thre exists t\\ possibility of the capscrews '; bottoming out",in the tappedlar.d thread d cylinder head holes, prior to che starting air, valve s
housing being propeM y positioned and torqued to the required value of 150 foot-pot nos".
For irstance, the torque wrench reading may be 150 foot-pounds dua to tk sapscrew 460ttoming out" but the housing may be secured with less than 150\\ foot-ptunds'.\\ When the starting air valve housing is not properly positionLd., the combustion gases escape by a copper gasket and the valve hcusing, desiroying a rubber 0-ring gasket, and leaking into the starting sair Reader 1 The escapidg gases " scour" or " burn away" the valve housing first, thes the valve set, and eventually the starting air valve.
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g.k PAGE 2 The loss of one starting air valve on each bank of the diesel, simultaneously, would compromise the ability of the diesel to start and be ready to accept a load within the 11 seconds time requirement.
ANALYSIS OF SAFETY IMPLICATION:
Provided the " burning away" of a starting air valve occurs only on one bank of the diesel, the diesel generator can still be started and be ready to accept the load requirements within the 11 seconds time requirements. How-ever, based on the assumption that the " burning away" of the valve could occur simultaneously on at least one cylinder per bank, and remain undetected, this situation could compromise the diesel generators' ability to be started and ready for load acceptance within the 11 seconds time requirement. There-fore, this could result in the unavailability of on site power.
CORRECTIVE ACTION:
Transamerica Delval recommends a modification that corrects the possible deficiency described above. The modification involves removing each of (128) one hundred twenty eight 3 inch long capscrews for the (4) Catawba diesels that are used to secure the starting air valves in the cylinder heads, and replacing these capscrews with 2-3/4 inch length capscrews.
The 2-3/4" capscrews will provide sufficient thread engagement, but will not " bottom out" prior to properly positioning the valve housing and meeting the required 150 foot-pounds of torque.
In addition, the (64) sixty-four copper 0-ring gaskets, along with the sixty-four rubber 0-ring gaskets will be replaced. The copper 0-ring gaskets tightly seal the bottom of the starting air valve housing and the rubber 0-ring gaskets seal the top of the housing from the air start header.
I Also, Transamerica Delval has modified its assembly procedures to prevent future recurrence of this problem.
The above corrective actions are expected by January 1,1983.
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