ML20004C789
| ML20004C789 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 05/28/1981 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8106050258 | |
| Download: ML20004C789 (3) | |
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south CAROLINA ELECTRIC & GAS COMPANY
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May 28, 1981
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Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Iff g g Region II, Suite 3100
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101 Marietta Street, N. W.
\\q js Atlanta, Georgia 30303
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Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 Significant Deficiency Final Report
/
Nuclear Eng. File 3.1051
Dear Mr. O'Reilly:
On May 22, 1981, Mr. Paul Kellog of NRC Region II was notified of a significant deficiency under 10CFR50.55(e) concerning moisture in component cooling pump motor lA.
This item was first reported to John Rausch Feb. 5, 1981, and followed by interim letter dated 3-10-81.
The item was first reported as a Potential Substantial Safety Hazard per 10CFR21; however, it has now been determined to be reportable as a significant deficiency per 10CFR50.55(e).
The details of the it'es are included in the attached 10CFR50.55(e) -
Significant Deficiency. This is considered the final report on the matter.
Very truly yours, f
T. C. Nichols, Jr.
l TAB:TCN:1kb l
cc:
V. C. Summer H. E. Yocom l
G. H. Fischer Document Management Branch T. C. Nichols, Jr.
(55e/21/LER Only) l
- 0. W. Dixon, Jr.
W (Washington)
Dr. John Ruoff (SEG l
D. A. Nauman NPCF l
W. A. Williams, Jr.
File R. B. Clary A. R. Koon A. A. Smith H. N. Cyrus J. B. Knctts, Jr.
S J. L. Skolds Nh)'!
B. A. Bursey
- 0. S. Bradham
10CFR50.55(e) - SIGNIFICANT DEFICIENCY 1.
Identification of Nonconformance The original Nonconformance 193 originated 12-8-80 when all three (A, B, and C) component cooling pump motors indicated wat'er on' the stators sight glass and "B" motor was found to have water in'the oil.-
The three motors were meggered and "A" motor was found to be grounded.
The "B" and "C" motors tested good. Upon examining the component cooling motors space heater circuits, a design error was discovered for motors "A" and "B."
The "C" motor design was okay. When the component cooling motors are not operating, the component cooling motor space heaters are energized to dry out the motor. The subject heaters are energized by two 52bb feeder breaker aux 11ary contacts when the feeder breaker is open. However, if the feeder breaker is racked cs out, the 52bb contacts will not.be energized to dry out the motor.
The stator coils of the Westinghouse motor has Thermalastic Epoxy Insulation which is coisture resistant. This totally enclosed water-cooled motor utilizing Thermolastic Epoxy Insulation is designed for use in higher than normal moisture conditions.
(Application Data 3170 page 4)
The moisture in motor A was not the cause for the component cooling :
pump motor lA to be grounded. Further investigation of the problem revealed the 1A motor was run without cooling water. The outlet water temperature of the cooler was observed at 240 F.
This resulted in NCN-95.
It was determined by Nuclear Engineering that the combined affect of the high temperature and additional moisture in the motor due to not energizing the component cooling pump motor space heater when the'-
motor was not operating caused the grounded condition in the 1A motor.
Nuclear Engineering made the decision to ship the component cooling motor lA to Westinghouse motor repair ' shop in Charlotte, NC for reinsulation of the motor.
2.
Number and Location of Nonconformance i
Component cooling pump motor lA located in Intermediate building floor 412'.
3.
Significant Deficiency Created and Evaluation The component cooling water system serves as intermediate, closed-loop -
cooling system to transfer heat from those components important to safety which contain potential radioactive fluids, to the Service Water System.
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Since at least two independent component cooling water loops shall be operable, a single failure in the B-loop in conjunction with the failure discussed above would result in no component cooling water being available.
4.
A.
Corrective Action of Control Circuits of Heaters for Component Cooling Pump Motor lA and IB Corrective action to allow the component cooling pump motor heater-circuits to be energized when the motor is not operating and also wh'en the circuit breaker. ' the motor is racked out has been done in CFR-3686.. The actual wo.k was performed by MWR-52516 and 52517.
This change should help to keep the. motor dryer when it is-not in use.
4.
B.
Corrective Action for Reinsulating of the Component Cooling Pump Motor 1A.
/
Component Cooling Pump motor LA was shipped to Westinghouse repair facility for reinsulation, inspecting, and testing of the stator windings. Surveillance Reports on the repair work are as follows.
Surveillance Report February 20, 1981 covering QA plan, specification and calibration.
Surveillance Report March 2-3, 1981 covering re-insulation work and rotor balancing and Surveillance Report March 9-10, 1981, covering test results.
4.
C.
Corrective Action Addressing Running Component Cooling Pumps With Out Cooling Water The Component Cooling Pump Motor was run without cooling water during the start-up testing phase at Summer Station. Operating procedures have been written for the operation of the Component Cooling pump motor and system. System Operating procedure SOP (118) deals with the Component Cooling system and it has a precaution section that will prevent the problem from occurring again.
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