ML19208A358
| ML19208A358 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/10/1979 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| TASK-TF, TASK-TMR GQL-0444, GQL-444, NUDOCS 7909130462 | |
| Download: ML19208A358 (2) | |
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Metropolitan Edison Company Post Office Box 542 gj
,e' Reading Pennsylvania 19640 215 929 J601 Wnter's Direct Dial Number septecter 10, 1979 G3 Chhh Director of Nuclear Reactor Regulation Attn: R.W. Reid, Chief Operating Reactors Eranch No. h U.S. ITuclear Regulatory Cecaission Washington, D.C.
20555 Ces-Sir:
Three Mile Island Nuclear Station, Unit 1 (SC-1 Operating License No. DFR-50 Docket No. 50-2S9 Moderator Dilution Accidents-This letter is in respcnse to your letter of February 12, 1979, requesting additional information en DE-l's potential for a boren dilution accident.
In response to your first concern, the cnly NaOH valves that require testing are the Engineered Safeguards valves which isolate the NaCH tank from the Decay Heat Removal System (i.e. 33-V2A and 35-723). Therefore,
'4et-Ed vill perform an analysis, as defined in your letter of September IL,1978 to determine the effects of a moderator dilution accident and assess the capability of the operators to respond to this event.
"'his analysis vill be forwarded to the NRC no later than Cetober 31, 1979
- n respcnse to your second concern, all of the pctential pathways for initiation of a moderator dilution accident have been reviewed. As a result of this review, it has been determined that only one such pathway exists.
"'his is, the beren diluticn accident by way of an inadvertant discharge of the NaOH tank into the Decay Heat Removal System while open to the Reactor Coolant System. Ecvever, as indicated abcve, an analysis vill be perferred to determine the effects of that accident.
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a September 9, 1979 R. 'd. REID GQL Chhh Until the t1 e that the results of the analysis are atailable, Met-Ed vill make temporary procedure changes to allev testing of only the sodium hydroxide tank engineered safenards accuated talre associated with the idle decay heat locp, thus pre' renting a possible baron dilution accident.
Sincerely,
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J. G. Herbein Vice President
- Tuclear Operatiens JGH:DGM: r.
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