ML20042F896
| ML20042F896 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/04/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20042F895 | List: |
| References | |
| NUDOCS 9005100125 | |
| Download: ML20042F896 (3) | |
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$UPPLEMENTAL SAFETY EVALUATION BY THE OFFICE OT, NUCLEAR REACTOR REGULATION i
RELATEDTORESPONSETOTHFSIATIONBLACK0UTRULE-(10CFR50.63) 11ETROPOJ'iAN EDISON COMPANY JERSEY CENTRA'l CWER & ' LIGHT COMPANY
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PENh5YLVAN O LECTRIC CONPANY GPU NUCtEAR CORPORATION ~
THREE MILE ISLAND NJCLEAR STATION. UNIT NO. 1 DOCKET NO. 50-289 l
1.0 INTRODUCTION
By letter dated January 25, 1990, GPU Nuclear Corporation (GPUN/ licensee) responded to the staff's December 18, 1989 Safety Evaluation Report (SER) on theStationBlackout(SBO) Rule. GPUN's letter provided clarification to certain statements in the staff's SER and provided additional information on the specifics of;the AAC source that will be used for station blackout.
L-2.0 EVALUATION:-
The following clarifications presented by the licensee are consistent with the staff's initial understending of the licensee's response to the SB0 rule. We find-these clarifications to be ecceptable.
1.
Staff's referral to the AAC Source as on EDG does not imply that the AAC system and its components are required to meet Class IE or Safety System requirements.
2.
The TMI-1 EDGs are not continually prelubed. Prs-i lubing is conducted prior to test starts.
3.
The new DC source will provide power to the AAC source and its associated breaker control.
It will not provide power for feeder breaker control on 4KV busses 10, 1D, and 1E.
4 The control room HVAC is powered from either THI-1 emergency bus. The AAC source will be available within 10 minutes to power either emergency bus and its associated equipment and has the capacity and capability of the normal EDGs and therefore can power the control room HVAC loads.
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5.
The SB0 modifications will be performed during refueling outage 9R which is currently _ scheduled for the fall of 1991.
The licensee states that the AAC source will be manually started from the TMl-1 control room rather than automatically upon detection of undervoltage. We find this to be acceptable.
The licensee states that the AAC source will utilize, for cooling purposes, the THI-1 fire service system and therefore will not be completely independent of TMI-1 services. However, the fire service system can provide the necessary water for this cooling function during an SB0 without relying upon off-site power, the TMI-l CDGs or the THI-2 DC distribution system. We find this meets the independence requircu nts of the SB0 rule and that it is therefore acceptable.
The licensee notes that figure 1 which was referred to in the staff's SER was not included with the SER. This was an inadvertent omission.
Figure 1 is attached to this SSER.
3.0 CONCLUSION
The NRC staff has reviewed the clarification statements submitted by the licensee by letter dated January 25, 1990. These clarifications statements were in response to staff's December 18, 1989 SER on the SB0 rule. We find the clarification statements to be acceptable.
Principal _ Contribu_ tor:
A. Toalston Dated:May 4, 1990
Attachment:
As stated b
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