ML19345G121
| ML19345G121 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 03/22/1974 |
| From: | Searls F PACIFIC GAS & ELECTRIC CO. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| 2498, NUDOCS 8103020610 | |
| Download: ML19345G121 (2) | |
Text
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4 PACIFIC GAS AND E LE C T RIC C O M PANY M O'J'3, l
77 BEALE STREET. SAN F R ANCISCO, C ALIFORNI A 94106. (415) 781 4211 easoenecxv.semaos
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Dear Sir:
Pursuant to Section IX.H.2.b. (2) of Appendix A to the Humboldt Bay Unit No. 3 Facility Operating License, we are hereby notifying you of a malfunction of the reactor cleanup pump.
The cleanup pump was removed from service at 1727 hours0.02 days <br />0.48 hours <br />0.00286 weeks <br />6.571235e-4 months <br /> on March 8, 1974, because of excessive leakage through the mechanical seal on the pump shaft.
Leakage through the seal was first noticed on March 5, 1974.
At the time the pump was removed from service, the leakage rate was still low enough to be handled by the leak off system, and there was no steam leaking through the seal.
Therefore, the airborne radioactivity in the area of the cleanup pump did not increase at any time as a result of this malfunction.
The loss of the cleanup pump does not render the cleanup system inoperable.
As in previous cases when the cleanup pump was out of service due to excessive seal leakage, the demineralizer effluent will be valved to the condenser hotwell instead of the reactor, utilizing the pressure differential between the reactor and the hotwell to operate the system.
Thus water quality will be maintained within license limits during normal operation.
The control rod hydraulic pumps (one of which is on the emergency power bus) may also be used to operate the cleanup system as a backup to the core spray system during post-incident decay heat removal operations.
Nevertheless, the loss of the cleanup pump does constitute a variance from the performance specifications contained in the Technical Specifications, specifically Section III. A. 3.d (2) and IV.A.4.
Accordingly, we consider the loss of the pun.p to be an unusual event as described in Section IX.H.2.b. (2).
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3/22/74 The pump manufacturer has been contacted and the Company is meeting with their representatives.to improve reliability of the cleanup pump shaft seal.
It is expected that repairs and any modifications to the pump will be completed and the pump returned to service within sixty days.
Very truly yours,
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Mr.
R.
M.
Engelken, Director Directorate of Regulatory Operations 4
Region V U.
S. Atomic Energy Commission P.
O. Box 1515 Berkeley, California 94701 l
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