ML19340C866
| ML19340C866 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 10/31/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8012170857 | |
| Download: ML19340C866 (1) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION n
REGION V o
1990 N. CALIFORNIA BOULEVARD o
SulTE 202. WALNUT CREEK PLAZA e,, as WALNUT CREEK, CALIFORNIA 94596 October 31, 1980 Docket Mos. 50-133, 50-275, 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: Mr. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
The enclosed Information Notice provides early notification of an event that may have safety significance. Accordingly, you should review the Information Notice for possible applicability to your facility.
No specific action or response is requested at this time; however, contingent upon the results of further staff evaluatic;n, a Bulletin or Circular recom-mending or requesting specific licensee actions may be issued.
If you have questions regarding this matter, please contact me.
Sincerely, h
y * !~
);'fft't k
'R. II. Engelken Dir'ector
/
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Enclosures:
i 1.
IE Information Notice No. 80-39 l
2.
Recently issued IE Information i
Notices cc w/ enclosures:
J. D. Shiffer l
W. Raymond, PG&E E. Weeks, PG&E, Humboldt Bay i
E. B. Langley, Jr., PG&E l
l n n o f %e7.
i 8o
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SSINS flo. : 6835 I
Accession t'o. :
8008220245 I
Irl 80-39 UNITED STATES JUCLEAR REGULATORY COMMISSION i
0FFICE OF INSPECTICi! AND Ef!FOPCEMENT i
UASHINGTON, D. C. 20555 Cctober 31
, 1980 IE INFORMATI0tl NOTICE NO. 80-39
- MALFUNCTION OF SOLEN 0ID VALVES MANUFACTURED BY VALCOR ENGINEERING CORPORATION I
PURPOSE:
The intent of this Infomation Notice is to alert holders of construction permits and operatina licenses for nuclear power plants of a potentially aeneric problem involvino the nalfunctionina of certain solenoid valves manu-factured by the Valcor Engineering Corporation (Valcor). The solenoid valves i
so jnvolved are designated as Valcor Valve Model No. V52600-554-1.
Valcor has informed us that these valves have only been supplied to the McGuire facility; i
i however, since these valves were substituted for solenoid valves of another manufacturer that did not meet the requirements of IE Bulletin No. 79-01 and its arendments, licensees and nolders of construction permits should take into l
account the problem identified in this Information Notice prior to making any similar substitution.
l BACKGRONND:
l i
By TUX dated June 27, 1930, Valcor submitted a preliminary 10 CFR Part 21 Report addressing the nalfunctioning of Valcor solenoid valves at the McGuire facili ty.
The malfunctioning valves have been identified as Valcor Valve Model No. 52600-554-1.
This TWX was subsequently followed by a letter dated July 3,1930, transmitting a more detailed Part 21 Report entitled," Quality Assurance Report", a copy of which is attached hereto as Enclosure No.1.
In brief, the ralfunction appears to be an intermittent type wherein the valve fails to cycle from OPEi! to CLOSE to OPEN immediately after a sustained period of operation in the energized (OPEN) mode. Although the valves are rated for
" continuous operation", Valcor contends that the valves were not designed to neet the operating conditions requiring the immediate cycling from OPEN to CLOSE to CPEN af ter a sustained period of continuous energization.
A major source of the problem, therefore, may be a misunderstanding of the term
" continuous operation". By letter dated July 14, 1980 to Duke Power Company, l
Valcor transmitted its recommendations in this matter entitled, " Outline -
1 Suggested "odification Procedures", a copy of which is attached hereto as Enclosure No. 2.
DUPLICATE DOCUMENT i
1 Entire document previously entered into system undery hG>0hN chb ANO No. of pages:
.