ML20065B003
| ML20065B003 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 11/03/1982 |
| From: | Empey D ROCKWELL INTERNATIONAL CORP. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML20065A964 | List: |
| References | |
| CON-82ESG8085, REF-PT21-83 82ESG8085, NUDOCS 8302220353 | |
| Download: ML20065B003 (3) | |
Text
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Eneroy Systems Group 4,
8900 De soto Avenuo Canoga Park, Cabtortua 91304 Rockwell Teiepnone:(213) 3451000 lniernational TWX: 910 4941237 Telex:181017 November 3, 1982 In reply refer to 82ESG8085 U.S. Nuclear Regulatory Comission Region IV 611 Ryan Plaza Drive Arlington, Texas 76012 Attention:
Mr. John Collins, Administrator Region IV
References:
1)
ESG Letter 82ESG7725, D. C. Empey to John Collins,
" Report of Deviation / Defect (10CFR21)" dated October 21, 1982.
2)
ESG Letter 82ESG7948, D. C. Empey to John Collins,
" Report of Possible Defect (10CFR21)" dated November 3, 1982 Gentlemen:
Subject:
Report of Possible Defect (10CFR21)
Energy Systems Group is currently undertaking a program to establish IEEE-323 qualification of our post-LOCA Hydrogen Recombiner designs.
This program is structured to umbrella equipment delivered in the past as well as* current and future production, and therefore speci-fies environmental conditions severe enough to satisfy any expected customer specifications.
As a result of this qualification effort to date, it has been deter-mined that the below noted component may not operate properly follow-ing the radiation exposure given in the ESG qualification program.
COMPONENT DESCRIPTION Timetrol SCR Power Controller - Three-phase, 10662 series, Part No.
2053C-125K.
Test Results During IEEE 323 Environmental Qualification Testing and after the unit 6
was irradiated with 1.62 x 10 rads, the SCR failed functional testing r302220353 830215 DRADOCK05000g
l Mr. John Collins, Administrator Page 2 Region IV November 3, 1982 U.S.. Nuclear Regulatory Commission 82ESG8085 and the SCR Power Controller was removed from the Qualification Program.
In hydrogen recombiner operation, loss of electrical power control to the heaters would result in a loss of safety function.
Corrective ction/ Comments We are recommending that the Timetrol unit be replaced with a Halmar unit (per our design on current production recombiners). None of the affected BWR plants are operating and this replacement can be done prior to startup.
Although three of the affected PWR plants are operating (Zion, North Anna, and Beaver Valley) the environment at the power / control cabinet should be such that replacement of the power controller can be done at any time. Al-though this expected low radiation environment could be interpreted as making replacement optional, Zion and TMI did include an overall radiation require-ment in their specifications to us and we cannot unilaterally determine that these radiation environments will not be seen by the power / control cabinets.
Affected Plants NRC Licensed Date Specified Radiation Customer Name Facility / Activity Qty Shipped Dose Rads TID Detroit Edison Fermi 2 NPS 2
08-76 Not Specified 5
Philadelphia Limerick 1 & 2 NPS 6
06-30-77 6 x 10 Electric Co.
Duquesne Light Beaver Valley 1 & 2 2
07-02-74 Not Specified Co.
North Anna, 1, 2, 3, 3
10-75 Not Specified
& Power Co.
and 4 NPS Northeast Millstone 3 NPS 2
02-77 Not Specified Utilities 5
Jersey Central Three Mile Island 2
03-77 2 x 10 Power & Light 2 NPS Co.
4 Coramonweal th Zion 1 and 2 NPS 2
10-05-73
< 10 Edison Co.
)
Mr. John Collins, Administrator
-Region IV Page 3 U.S. Nuclear Regulatory Commission November 3, 1982 82ESG8085 1
Notifications Each listed plant operator has been notified of the. results of our IEEE 323 qualification testing along with our recommendation for replacement of 1
these units.
Additional components which failed to' function properly fol-lowing the qualification environments given in our program are reported in the References.
If you require further information or clarification, please call me at (213) 700-3926.
Very truly yours,
~
i i
D. C. Empey Director Quality Assurance cc:
(3)
Director, Office of Inspection and Enforcement -
U.S. Nuclear Regulatory Commission Washington, DC 20555 I
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