ML19225A351
| ML19225A351 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/06/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 7907190069 | |
| Download: ML19225A351 (1) | |
Text
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fJuCLEAR REGULATORY COMMISSION G?
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631 PARK AVENUE
%.\\+#,e KING OF PRUSSI A, PENNSYLVANIA 19406 June 6, 1979 Docket Nos. 50-336 50-245 50-423 Northeast Nuclear Energy Company ATTN: Mr. W. G. Counsil Vice President - Nuclear Engineering and Onerations P. O. Box 270 Hartford, Connecticut 06101 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 permit.
No action or written respcnse 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, M4< _
Boyce H. Grier
~~~~ Director
Enclosures:
1.
IE Bulletin No. 79-OlA 2.
List of IE Bulletins Issued in Last Twelvo Montns 3.
List of SEP Plantr (11) cc w/encls:
K. W. Gray, Construction Quality Assurance Lead H. R. Nims, Director of.luclear Projects J. F. Opeka, Statico Superintendent D. G. Diedrick, V,anager of Quality Assurance J. R. Himelwright, Licensing Safeguards Engineer
.1. Z. Roisman, Natural Resources Defense Council 79071900gg 347 345
4 ENCLOSURE 1 UNITED STATES NUCLEAR REGULATOP.Y COMMISSION WASHINGTON, D.C.
20555 IE Bulletin No. 79-016 Date:
June 6, 1979 Page 1 of 3 SUPPLEMENT NO.79-01A TO TE BULLETIN 79 ENVIRON". ENTAL QUALIFICATION CF CLASS 1E EQUIPMENT (DEFICIENCIES IN THE ENVIRONMENTAL QUALIFICATION OF ASCO S0LEN0ID VALVES)
Description of Circumstances:
Recently, a noncompliance report under 10 CFR Part 21 was received by the NRC from the Henry Pratt Compan), manufacturer of butterfly valves which are installed in the primary containment 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 operation under accident conditions.
The solenoid valve in question is Catalogue No. HT-8331A45, manufactured by the Automatic Switch Company (ASCO) of Florham Park, Nei Jersey. This pilot valve is used to pilot control the pneumatic valve actuators which are installed on the containment ventilation butterfly valves at 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 botton plug in the pilot valve assembly are stated by ASCO to have a maximum servica limit of 400,000 Rad integrated dosag2 and 200 degrees F temperature.
Accordicq to ASCO, exposure of these acetal clastic parts to speci#ied maximum environmental conditions may render the solenoid pi':t valve inoperable which would cause the associated butterfly valve to malfunction.
Further in/escigation 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 dasage 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 p'astic parts, utilize ethylene propylene or viton elastomers and have a coatinuously energized operating life of four years, under normal embient conditions up to 140 degrees F.
According to the manufacturer, at the end of this neriod, the coil, manual operacor (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.
g The final items of concern identified dlDUPLICATE DOCUMENT
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application of Class "A", "B',', or "F", f Entire document previously entered accident environment.
In this regard, ;into system under.
ANO 7 L
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