ML19246B969
| ML19246B969 | |
| Person / Time | |
|---|---|
| Site: | Marble Hill |
| Issue date: | 06/06/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Coughlin J PSI ENERGY, INC. A/K/A PUBLIC SERVICE CO. OF INDIANA |
| References | |
| NUDOCS 7907190288 | |
| Download: ML19246B969 (1) | |
Text
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[ja ascg UNITED STATES
'o, NUCLE AR REGULATORY COMMISSION r (f'
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u REGloN lll o, h ""7cg' 799 ROOsEVE LT RO AD a
cLes ELLvN. itusOis sont s, -- p JUN 6 1979 Docket No. 50-546 Docket No. 50-547 Public Service of Indiana niTN:
Dr. James Coughlin Vice President, Nuclear 1000 East Main Street Plainfield, IN 46168 Gentlemen:
Enclosed is supplement IE Bulletin No.79-01A.
It requires action by you with regard to power reactor facilities with an operat ing 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 facilities or the 11 SEP plants.
Should you have questions regarding this Bulletin or the actions required of you, please contact this office.
Sincerely, E [b.
6*If
/
LJames G. Keppler i
Director
Enclosure:
IE Bulletin No.79-01A cc w/ encl:
Mr. R. M. Brown, Construction Project Superintendent Centcal Files Dire : tor, NRR/DPM Director, NRR/ DOR PDR
.s Local PDR
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/_/d NSIC TIC LeBoeuf, Lamb, Leiby & MacRae 79071hoggg
U.S. NUCLEAR REGULATORY C0}S11SSION OFFICE OF INSPECTION AND ENFORCEMEST
" REGION III June 6, 1979 IE Bulletin No.79-01A SUPPLEMENT NC.79-01A TO IE BULLETIN 79 ENVIRONMENTAL QUALIFICATION OF CLASS 1E EQUIPMENT (1)EFICIENCIES IN THE ENVIRONMENTAL QUALIFICATION OF ASCO SOLENOID VALVES)
Description of Circumstances:
Recer:ly, a noncompliance report under 10 CFR Part 21 was received by the NRC from ;he Henry Pratt Co=pany, manufacturer of butterfly valves which are insta' led 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-83:lA45, 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 acett.1 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 malfr etion.
Further investigation at ASCO by the NRC staff has revealed that the valve seals in most ASCO solencid 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 investigadon further revealed that ASCO has available a line of qualified solenoid operated pilot valves (ASCO Catalogue No. hT-1) which have no plastic parts, utilize ethylene propylene or viton elastocers and have a continuously energized operating life of four years, under normal ambient conditions up to 140 degrees F.
According to the manu-facturer, at the end of this period, the coil, manual operater (optional fea-ture) 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 f;4 r y f.c @ noid valves.,
m The final items of concern identified dt' DUPLICATE DOCUMENT application of Class "A",
"B",
or "F",
s j
accident environment.
In this regard, / Entire document previously entered into system under:
g ANO ]
f)) 0 l No. of pages:
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