ML19225A368
| ML19225A368 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/06/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 7907190094 | |
| Download: ML19225A368 (1) | |
Text
p arco d
o UNITED STATES I8 8 y ) e c *('
NUCLEAR REGULATORY COMMISSION g,.
. p REGION I 3 75.
Ua 631 PARK AVENUE
\\.." '.+.'. o KING OF PRUSSIA, PENNSYLVAfJ1 A 1940G June 6, 1979 Docket Nos. 50-277 50-278 Philadelphia Electric Company ATTN:
Mr. S. L. Daltroff Vice President Electric Production 2301 Market Street Philadelphia, Pennsylvania 19101 Gentlemen:
Enclosed is supplement IE Bulletin 79-01 A.
It requires action by you with regard to power reactor facility (ies) with an operating license except for the 11 SEP (Systematic Evaluation Program) plants which are listed in Enclosure 3.
This Bulletin is also being sent for information to the 11 SEP plants and all power reactor facilities with a construction pennit.
No action or written response is required for these two categories of facilities.
Should you have questions regarding this Bulletin or the actions required of you, please contact this office.
Sincerely,
/
Y.
3 voyce 1. Grier Director
Enclosures:
1.
List cf IE 3Jlletins Issued in Last Twelve Months 3.
List of SEP Plants (11) cc w/encls:
W. T. Ullrich, Station Superintendent Troy B. Conner, Jr., Esquire Eugene J. Bradley, Esquire Raymond L. Hovis, Esquire Warren Rich, Esquire j ';)
79071999 L]0
ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C.
20S55 IE Bulletin No.79-01A Date: June 6, 1979 Page 1 of 3 SUPPLEMENT N0.79-01A TO IE BULLETIN 79 ENVIRONMENTAL QUALIFICATION OF CLASS 1E EQUIPMENT (CEFICIENCIES IN THE ENVIRONMENTAL QUALIFICATION OF ASCO SOLENCID VALVES)
Description of Circumstances:
Recently, a noncomsiiance report under 10 CFR Part 21 was received by the NRC from the Henry Pratt Company, manufacturer of butterfly valves which are installed in the primary contsinment at the Three Mile Island Unit 2 Nuclear Station.
These butterfly valves are used for purge and exhaust purposes and are required to operate during accident conditions.
The report discusses the use of an unqualified solenoid valve for a safety-related valve function which requires ooeration under accident conditions.
The sole? )id valve in question is Catn'.ogue No. HT-8331A45, manufactured by the Automatic hitch Company (ASCO) of Florh m Park, New Jersey.
This pilot valve is used to pilot control the pneumatic va! /e actuators which are installed on the containment ventilation butterfly valves ai.
this facility.
The deficiency in these solenoid valves identified in the Part 21 Report concerns the parts made of acetal plastic material.
The acetal disc holder assembly and bottom plug in the pilot valve assembly are stated by ASCO to have a maximum service limit of 400,000 Rad integrated dosage and 200 degrees F temperature.
According to ASCO, exposure of these acetal plastic parts to specified maximum environmental conditions may render the solenoid pilot valve inoperable which would cause the associated butterfly valve to malfunction.
Further investigation at ASCO by the NRC staff has revealed that the valve seals in most ASCO solenoid valves contain Buna "N" elastomer material, which reportedly has a maximum service limit of 7,000,000 Rad integrated dosage and 180 degrees F temperature.
The investigation further revealed that ASCO has available a line of qualified solenoid operated pilot valves (ASCO Catalogue No. NP-1) which have no plastic parts, utilize ethylene propylene or viton elastomers and have a continuously energized operating life of four years, under normal embient conditions up to 140 degrees F.
According to the manufacturer, at the end of this period, the coil, manual operator (optional feature) and all resilient parts must be replaced.
These preventive maintenance instructions are specified in the installation and instruction bulletins which are provided to the purchaser with each shipment of solenoid valves.
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The final items of concern identi-DUPLICATE DOCUMENT application of Class "A", "B", or J
accident environment.
In this re! Entire document previously entered
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