ML20214S396
| ML20214S396 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/27/1986 |
| From: | Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | James Keppler, James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| AEP:NRC:0775AH, AEP:NRC:775AH, IEIN-86-003, IEIN-86-3, NUDOCS 8609290481 | |
| Download: ML20214S396 (8) | |
Text
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e INDIANA & MICHIGAN ELECTRIC COMPANY P.O. BOX 16631 COLUMBUS, OHIO 43216 August 27, 1986 AEP:NRC:0775AH
. Donald C. Cook Nuclear Plant Unit Nos. 1 and 2 Docket Nos. 50-315 and 50-316 License Nos. DPR-58 and DPR-74 LIMITORQUE MOTOR VALVE OPERATOR WIRING Mr. James G. Keppler, Regional Administrator U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137
Dear Mr. Keppler:
Pursuant to the request of Mr. N. Gautam of your staff on August 1, 1986, this letter transmits the results of the actions we have taken regarding IE Information Notice 86-03, " Potential Deficiencies in Enviren= ental Qualification of Limitorque Motor Valve Operator Wiring."
This information is available in File 8I of our Central Equipment Environmental Qualification File, both at the plant and at our corporate offices in Columbus, Ohio.
In response to this Information Notice, we initiated a formal walkdown program to inspect the internal control wiring in the environmentally qualified Limitorque motor operators at Cook. The attachment to this letter is a list of all of the Limitorque operators which have been inspected at the Cook Plant. The details of our inspection are on file at the plant.
Of the 146 Limitorque operators inspected, seven were found to contain jumper wires made of undocumented material. As we stated in our letter AEP:NRC:0775AF, the undocumented wire in those seven operators was immediately replaced with wire which had been qualified in accordance with the requirements of 10 CFR 50.49.
The following table provides the location and function for each of the seven valves found to contain undocumented wire.
Valve Location Function 2-WMO-714 Outside containment Exit valve in ESW (normally closed) in Auxiliary Building, System for the 2E Essential Service Water containment spray System heat exchanger 2-WMO-724 Outside containment Provide cooling water (normally closed) in Auxiliary Building to 2-AB emergency Essential Service diesel generator Water System t \\
~8609290481 860827 PDR ADOCK 05000315 AUG 2 s g g
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Mr. Harold R. Denton AEP:NRC:0775AH Valve Location Function 2-WMO-726 Outside containment Provide cooling water (normally closed) in Auxiliary Building, to 2-CD emergency Essential Service Water diesel generator System 1-IMO-54 Inside containment In SI line to loop 4.
(normally open) outside missile block From BIT in SI line 1-IMO-315 Inside containment, Used for switchover (normally closed) outside missile block from cold-leg to hot-in low head SI line leg recirculation.
which injects ECCS water into the hot leg of loops 1 and 4 of RCS 1-IMO-316 Inside containment Normal ECCS injection (normally open) outside missile block and switchover from in low head SI line cold-leg to hot-leg which injects ECCS recirculation water into cold leg of loops 1 and 4 of RCS 1-IMO-910 Outside containment in Provide RWST to (normally closed) suction line from RWST charging pumps to charging pumps for safety injection The walkdown was initiated in March 1986 and completed in July 1986.
During that period of time, we had a special audit on environmental qualification by the NRC.
The persons participating in that audit provided further suggestions as to the requirements of the Limitorque valves. As a result of their suggestion, we took additional action as summarized in our letter AEP:NRC:0775AE.
In parallel with this effort, we also performed safety evaluations of the impact of what we had found. On four of the valves (2-WM0-714, -724,
-726, and 1-IMO-910) we foun'd no impact whatsoever, since they were not located in an area that would be affected by a HELB and therefore did not require special environmental qualification for high-energy line breaks. On the three valves inside containment, we found there was no impact on IMO-54 because the valve was not functionally required to change position following a high-energy line break inside containment.
On two valves, IMO-315 and IMO-316, we found a safety impact, since these val es are required for the change from cold-leg to hot-leg recirculation 24 haurs following a postulated loss-of-coolant accident.
Since the affected valves were restricted to one of the safety trains, :lue other, redundant train would have been available for use in a design-basis accident.
However, since the problem was restricted to lack of documentation with the jumper wires, we conducted an engineering evaluation to determine whether the valves could
Mr. Hzrold R. D5nton AEP:NRC:0775AH have performed their intended safety function. Our conclusion was that they could have performed this function of switchover from cold to hot leg recirculation. On the basis of our evaluation, we believe that the event did not constitute a significant safety hazard.
This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to insure its accuracy and completeness prior to signature by the undersigned.
Very truly yours, 1
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P. Alexich}'g -
Vice President cm cc: John E. Dolan W. G. Smith, Jr. - Bridgman R. C. Callen G. Bruchmann G. Charnoff NRC Resident Inspector'- Bridgman f
i
Mr. Harold R. Danton AEP:NRC:0775AH bc:
J. C. Feinstein/D. E. van Deusen S. H. Horowitz/T. O. Argenta/R. C. Carruth J. J. Markowsky/S. H. Steinhart/J. A. Kobyra R. W. Jurgensen R. F. Kroeger M. L. Horvath - Bridgman
]
E. A. Morse - Bridgman C. A. Erikson J. B. Shinnock D. L. Wigginton, NRC - Washington, D.C.
AEP:NRC:0775AH DC-N-6015.1 4
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1 Attachment to AEP:NRC:0775AH MOTOR-OPERATED VALVES UNIT 1 VALVE & NO.
SIZE & TYPE CMO-419.
14" BUTTERFLY CMO-429 14" BUTTERFLY FMO-211 4" GLOBE R10-212 4" GLOBE R10- 221 4" GLOBE n!0-222 4" GLOBE n!0-231 4" GLOBE FMO-232 4" GLOBE FM0-241 4" GLOBE R10- 242 4" GLOBE ICM-250 4" GATE ICM-251 4" GATE ICM-260 4" GATE ICM-265 4" GATE ICM-305 18" GATE ICM-306 18" CATE ICM-311 8" GATE ICM-321 8" CATE IMO-51 1 1/2" GLOBE IMO-52 1 1/2" GLOBE IMO-53 1 1/2" GLOBE IMO-54 1 1/2" GLOBE IMO-210 10" GATE IMO-211 10" GATE IMO-212 2" GATE IMO-215 12" GATE IMO-220 10" GATE IMO-221 10" GATE IMO-222 2" GATE IM0-225 12" GATE IM0-255 4" GATE IMO-256 4" GATE IMO-262 2" GLOBE IM0-263 2" GLOBE IMO-270 4" GATE IMO-275 4" GATE IMO-310 14" GATE IM0-312 2" GLOBE IMO-314 8" GATE IMO-315 8" GATE IMO-316 8" GATE IMO-320 14" GATE IMO-322 2" GLOBE IM0-324 8" GLOBE IM0-325 8" GATE IMO-326 8" GATE IMO-330 8" GATE
Attachment to AEP:NRC:0775AH Page 2 UNIT 1 VALVE & NO.
SIZE TYPE IMO-331 8" GATE IMO-340 8" GATE IMO-350 8" GATE IMO-360 4" GATE IMO-361 4" GATE IMO-362 4" GATE IM0-910 8" GATE IMO-911 8" GATE MCM-221 4" GLOBE MCM-231 4" GLOBE NMO-151 3" GATE NMO-152 3" GATE NMO-153 3" GATE QCM-250 4" GATE QMO-225 2" GLOBE QMO-226 2" GLOBE VMO-101 14" GATE VMO-102 14" GATE k'MO - 711 12" BUTTERFLY k?to-713 12" BUTTERFLY k?!O-715 12" BUTTERFLY k'MO - 717 12" BUTTERFLY k'MO - 721 6" BUTTERFLY k?to-723 6" BUTTERFLY k?!O-725 6" CATE k?!O - 727 6" BUTTERFLY
Attachment to AEP:t!RC:0775AH Page 3 UNIT 2 MOTOR-OPERATED VALVES VALVE & ?!O.
SIZE & TYPE CMO-419 14" BUTTERFLY CM0-429 14" BUTTERFLY FMO-211 4" GLOBE
~ FMO-212 4" GLOBE FMO-221 4" GLOBE FMO-222 4" GLOBE FMO-231 4" GLOBE FMO-232 4" GLOBE FMO-241 4" GLOBE FMO-242 4" GLOBE ICM-250 4" GATE ICM-251 4" GATE ICM-260 4" GATE ICM-265 4" GATE ICM-305 18" GATE ICM-306 18" GATE ICM-311 8" GATE ICM-321 8" GATE IMO-51 1 1/2" GLOBE IMO-52 1 1/2" GI GBE IMO-53 1 1/2" GLOBE IMO-54 1 1/2" GLOBE IMO-210 10" GATE IMO-211 10" GATE IMO-212 2" GATE IMO-215 12" GATE IMO-220 10" GATE IMO-221 10" GATE IMO-222 2" GATE IMO-225 12" GATE IMO-255 4" GATE IMO-256 4" GATE IMO-262 2" GLOBE IMO-263 2" GLOBE IM0-270 4" GATE IMO-275 4" GATE IM0-310 14" GATE IMO-312 2" GLOBE IMO-314 8" GATE IMO-315 8" GATE IMO-316 8" GATE IMO-320 14" GATE IM0-322 2" GLOBE IMO-324 8" GATE IMO-325 8" GATE 1
IMO-326 8" GATE IMO-330 8" GATE IM0-331 8" GATE 1
Attachment to AEP:WRC:0775AH Page 4 UNIT 2 MOTOR-OPERATED VALVES VALVE & NO.
SIZE & TYPE IM0-340 8" GATE IMO-350 8" GATE IMO-360 4" GATE IM0-361 4" GATE IMO-362 4" GATE IMO-910 8" GATE IMO-911 8" GATE MCM-221 4" GLOBE MCM-231 4" GLOBE NMO-151 3" GATE ta10-152 3" GATE NMO-153 3" GATE QCM-250 4" GATE QMO-225 2" GLOBE QMO-226 2" GLOBE VMO-101 14" GATE VMO-102 14" GATE k?t0-712 12" BUTTERFLY k?to-714 12" BUTTERFLY k?to-716 12" BUTTERFLY k'MO-718 12" BUTTERFLY k?!O-722 6" GATE k?t0-724 6" GATE k?t0-726 6" GATE k?t0-728 6" GATE