ML19329C116
| ML19329C116 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 04/11/1977 |
| From: | Muzetis G Office of Nuclear Reactor Regulation |
| To: | Engle L Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8002120849 | |
| Download: ML19329C116 (2) | |
Text
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o Distribution:Chncket F h NRR Rdg. tile RSB File APR 111977 G.Mazetis Mazetis chron Docket No, 50-346 MEMORANDUM FOR: Leon Engle, Licensing Project Manager, LWR-1, DPM THRU:
T. M. Novak, Chief, Reactor Systems Branch, DSS FROM:
G. R. Mazetis, Section Leader, RSB, DSS
SUBJECT:
DAVIS BESSE UNIT NO. 1 FSAR REVISIONS
References:
a) Hemo from Victor Stello, Jr. to Voss A. Moore dated March 28, 1975.
b) Memo from G.R. Mazetis to L. Engle dated July 21, 1975.
c) Memo from G.R. Mazetis to L. Engle dated Nov. 4, 1975.
The above references expressed concern that FSAR revisions were being made with no justification and with the possibility of going unobserved by the staff. Recent reviews of Amendments centinue to emphasize this matter. Examples include:
1.
Revision 23 dated November 1976 Changed HPI/LPI delay time from 25 to 30 seconds.
Comment: What was the reason for the change and what is the impact on the main steam line break (25 sec. assumed)?
2.
Revision 23 dated Noverrber 1976 Lowered setpoint of primary safety valves from 2500 psig to 2435 psig.
Comert: What was the reason for the change and what is the impact on safety analyses?
3.
Revision 25 dated December 1976 Low pressure trip setpoint went from 1900 psig to 1985 psig.
Coment: What was the reason for the change and what is the impact on safety analyses?
Contact:
G. Mazetts, NRR 49-7.7341 T./
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L. Engle APR 11 1977 Other key analytical assumptions on setpoints may also have changed.
It is requested that the applicant provide the reasons for these changes and their impact, if any, on the Chapter 15.0 analyses.
Also, as discussed with you previcusly, acceptance of the HPI mini-ypass recirculation line equipment changes proposed by TECO are contingent upon concurrence by the staff of the arguments soon to be submitted by the applicant.
Orig!nal sLtr.ed hys Gerald R. Mazetis, Section Leader Reactor Systems Branch Division of Systens Safety cc:
D. Ross D. Vassallo T. Novak J. Stolz O
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