ML19246B971
| ML19246B971 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 06/06/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Jeffery Grant TOLEDO EDISON CO. |
| References | |
| NUDOCS 7907190290 | |
| Download: ML19246B971 (1) | |
Text
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j ctt N E L L f N. ILUNOIS 60ln JUN 6 1979 Docket no 20-346 Toledo Ediron Company ATTN:
Mr. James S. Grant Vice President - Energy Supply Edison Plaza 300 Madison Avenue Toledo, OH 43652 Gentlemen:
Enclosed is supplement IE Bulletin No.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 constrection 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, Nf mes G. Keppler Director
Enclosure:
IE Bulletin No.79-01A cc w/ encl:
Mr. 'l. D. Murray, Station Local PDR Superintendent NSIC Central Files TIC Director, NRR/DPM Harold W. Kohn, Power Director, NRR/ DOR Siting Commission PDR Helen W. Evans, State of Ohio 343 275 79071s ono
U.S. NUCLEAR REGULATORY COMMISSION 0FFICE OF INSPECTION AND ENFORCEMENT
" REGION III June 6, 1979 IE Bulletin No.79-01A SUPPLEMENT NO.79-01A TO IE EULLETIN 79 ENVIRONMENTAL QUA*IFICATION OF CLASS 1E EQUIPMEh'I (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 fron the Henry Pratt Co=pany, manufacturer of cutterfly valves which are instm.' led in the primary containment at the Three '.ile 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 cf an unqualified solenoid valve for a safety-related valve function which requi ts operation under accident conditions.
The solenoid valve in question is Ca:alogue No. HT-8331A45, manuf actured 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 velve assembly are state' 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 molfunction.
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 pilut valves (ASCO Catalogue No. hT-1) which have no plastic parts, utilize ethylene propylene or viton elastomers 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 operator (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 witt
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No. of pages:
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