ML19225A474
| ML19225A474 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 06/06/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 7907190390 | |
| Download: ML19225A474 (1) | |
Text
.
CENTRAL FILES PDR:HQ
/
a a'c,k r
o UNITED STATES 3
'o NUCLEAR REGULATORY COMMISSION
$,7)
' E REGION IV UbIC 0,, N
[
611 RYAN PLAZA DRIVE, SUITE 1000 D
- ';9
,o
+
June 6, 1979 Docket Nos.
50-313 50-368 Arkansas Power and Light Company ATTN:
Mr. William Cavanaugh III Vice President of Generation and Construction P. O. Box 551 Little Rock, Arkansas 72203 Centlemen:
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.
Thia Bulletin is also being sent for information to the 11 SEP plants and all No action or written power reactor f acilities with a construction pemit.
response is required for construction pemit facilities or the 11 SEP plants.
Should you have questions regarding this Bulletin or the actions required of you, please contact this office.
Sincerely,
&adifl!b Y Karl V. SeyfriK Director
Enclosures:
1.
List of IE Bulletins Issued in the Last 12 Months 3.
List of SEP Plants (11) cc: James P. O'Hanlon, Plant Manager Arkansas Nuclear One
!qhr P. O. Box 608
, [f 2 f4 l
Russellville, Arkansas 7280' L. Alexander, QC Supervisor 9
790319o340
UNITED STATES NUCLEAR REGUI.ATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT 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 SOLEN 0ID VALVES)
Description of Circumstances:
Recently, a noncompliance 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 contain=ent at the Three Mile Island Unit 2 Nuclear S ta tion.
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 Caitch 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 tempera ture. 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" clastomer 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 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 b
" ' - ~ - ' ' ' ~ " - ' '
e instructions are specified in the in
,I DUPLICATE DOCUMENT are provided to the purchaser with e
]
The final items of concern identifie.' jEntire document previously entered 4into system under:
application of Class "A," "B," or "F accident environment.
In this regar ANO 7 h 70 R U/7 h C7 No. of pages:
[)
k c,, 3 i<>;
~-
n.-_
,,y
..g 3( -
-