ML19225A484
| ML19225A484 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 06/06/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 7907190403 | |
| Download: ML19225A484 (1) | |
Text
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REGION IV j
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June 6, 1979 Docket No.
50-298 Nebraska Public Power District ATTN:
J. M. Pilant, Director Licensing & Quality Assurance Post Office Box 499 Columbus, Nebraska 68601 Gentlemen:
Enclosed is supplement IE Bulletin 79-01A. It requires action by you with regard to power reactor facilities with an operating license except for the 11 SEP 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 response is required for construction permit facilitics or the 11 SEP plants.
Should you have questions
,arding this Bulletin or the actions required of you, please contact this office.
Sincerely, f
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W Ka
. Seyfrit
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I Director
Enclosures:
1.
List of IE Bulletins Issued in the Last 12 Months 3.
. List of.SEP Plants (11) cc:
L. C. Lessor, Superintendent Cooper Nuclear Station Post Office Box 98 Brcwnvilla, Nebraska 68321 9
790?19o e
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND EhTORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No.79-01A Date: June 6, 1979 Page 1 of 3 SUPPLEMENT NO.79-01A TO IE BULLETIN 79 ENVIRONMENTAL QUALIFICATION OF CLASS 1E EQUIPMENT (DEFICIENCIES IN THE ENVIRONMENTAL QUALIFICATION OF ASCO SOLENOID VALVES)
Description of Circumstances:
Recently, a noncompliance report under 10 CFR Part 21 was received by the NRC from the Henry Pratt Cc=pany, 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 discus.:es 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, New Jersey. This pilot valve is used to pilot control the pneumatic valve actuators which are installed on the containment ventila-tion 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 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 "ause 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,
- nder normal ambient conditions up to 140 degrees F.
According to the manu-tacturer, at the end of this period, the coil, manual operator (optional fea-ture) and all resilient parts aust be replaced. These preventive maintenance k
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W A instructions are.apecified in the insta are provided to the purcha.wr with eachf DUPLICATE DOCUMENT t
The final items of concern identified dJ Entire document previous 1 i
t application of Class "A," "B," or "F," H into system undcr:
accident environment.
In this regard, No. of pages:
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