ML19262A694
| ML19262A694 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/05/1979 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| GQL-1467, NUDOCS 7912100328 | |
| Download: ML19262A694 (1) | |
Text
Metropditan Edison Company 6
Post Othee Box 542 Reading Pennsylvania 19640 215 929-3601 Writer's Direct Dial Number December 5, 1979 GQL 1h67 Director of Nuclear Reactor Regulation Attn:
R. W. Reid, Chief Operating Reactor Branch No. h U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Sir:
Three Mile Island Nuclear Station, Unit I Operating License No. DPR-50 Docket No. 50-2S9 Moderator Dilution Accicents This letter is in response to a telecon with Mr. DiIanni of your staff on November 21, 1979 Specifically, Mr. DiIanni requested Met-Ed to verify that all potential pathways for initiation of a moderator dilution accident have been reviewed and that both manual valves, one upstream and one down-stream of the ES-accuated valve, are closed prior to inservice inspection testing of the ES valve.
In response to the first request, Met-Ed has reviewed all potential pathways for initiation of a moderator dilutica accident (other than those listed in the TMI-1 FSAR and the Sodium Hydroxide injection) and discovered no other mechanism.
Ccncerning the second item for discussion, Met-Ed's procedures require both manual valves, which bracket the ES-operated valve, to be closed prior to testing the motor-operated valve, thus preventing e, moderator dilution accident occurring due to a failure of one of the manual valves.
Sincerely,
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