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SAFETY EVALUATION REPORT GRAND GULF NUCLEAR STATION UNIT 1 1
ECCS' Surveillance (Item 344)
Background
In a letter dated April 11, 1984, from J.
P. McGaughy to H.
R. Denton, Mississippi Power & Light Company (the licensee) requested a change to the technical specifications for Grand Gulf Nuclear Station Unit 1.
The requested change is to sur-veillands requirement 4. 5.1. b a nd increases the total head wh i c h m u,s.t be developed at a specified flow rate to demonstrate operability of the LPCS, LPCIr and HPCS pumps.
Safety Evaluation The proposed change is more conservative than the original
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specification in that it requires a higher developed head for each pump at the same flow rate.
The higher head would allow earlier injection into the-reactor vessel in the event of a loss-of-coolant accident.
The licensee has stated that the proposed change accounts for ECC system design flow require-ments and system losses.
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. We have compared the proposed specification to the flow vs.
head assumptions used in the ECCS analyses.
The specification 5
requires a significantly higher developed head at the pump 8507200271 850515 PDR FOIA BELL 84-459 PDR t.
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, than assumed at the vessel in the LOCA analyses.
This indicates q
that system losses have been accounted for in the specification.
The changes proposed constitute a more stringent limitation than is presently included in the technical specifications and arer therefore, more conservative.
The proposed changes do not:
1.
Involve a significant increase in the probability or consequences of an accident previously evaluated; or 2.
Create the possibility of a new or different kind of accident frca any accident'previously evaluated; or 3.
I n v o l.v e a significant reduction in a margin of safety.
- t' l The proposed changes arer th.erefore, acceptable.
Accident Monitoring Instrumentation Table 3.3.7.5-1 (Item 329)
Background
o In a letter dated April 10, 1984, from J.
B. Richard to l
H.
R.
Dentoni Mississippi Power & Light Company (the licensee) requested ' changes to the technical specifications for Grand Gulf Nuclear Station Unit 1.
The proposal would change the 0
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s' operational conditions for which LCO 3.3.7.5 is applicable.
The 6 resent applicability is for operational conditions 1 and 2 for all instrumentation.
The proposed change extends ap-p l i c a b i,li t y to other conditions (3r 4 and 5) on an instrument specific basis.
Safety Evaluation The p r o phs e.d s p e ci fi c a t i on.i s m o r e conservative than the exist-ing specjfication in all cases since the applicable operational conditions are being expanded to conditions not previously in-d' c l u ' e d.- The proposed change does not:
-1.
. Involve a significant increase in the probability or
'l consequen'ces of an accident previously evaluated; or
'i 2.
Create the possibility of a new or different kind of accident from any accide,nt previously evaluated; or
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3.
Involve a significant reduction in a margin of safety.
4 The proposal i s, t h e r e f o r e's acceptable.
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'&$pancy(g UNITED STATES
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',' g NUCLEAR REGULATORY COMMISSION l
WASHINGTON D. C. 20555 c
%,.....f Docket No. 50-416 MEMORANDUM FOR: Thomas M. Novak, Assistant Director for Licensing, DL FROM:
Daniel R. Muller, Assistant Director for Radiation Protection, DSI
SUBJECT:
SAFETY EVALUATION OF PROPOSED TECHNICAL SPECIFICATION CHANGES FOR GRAND GilLF NUCLEAR STATION, UNIT NO.1, (TAC N07 5" 31730 51:14) 3 % G 'l PLANT NAME: Grand Gulf Nulear Station, !! nit No.1 LICENSING STAGE: OR DOCKET NUMBER:
50-423 RESPONSIBLE BRANCH: LB#2; D. Houston, LPM REVIEW STATUS: Complete M419.c ad Q In accordance with the requests in your transmittal dated 'trd F,1984, the Meteorology and Effluent Treatment Branch (METB) has completed its review and evaluation of proposed Grand Gulf Technical Specification changes requested in Mississippi Power and Light Company's letter dated c^^+^"^-
Apv \\ 7 19 84 f.c dj rh i n"^ '"^
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- 7. T~I-1,
- 4. a. /. i-4 to e rc.1-1, and 4.3.12.1-1 which specify radioactive liqui
. seous processh"1" ant monitoring instrumentation.
n that the licensee' requests to amend UeTfm&O!'f Tec pecifications to be acceptable 1
ince these changes are mo minis hQure and do not relax
( the radiatp monitoring instrumentation requireim:no.
""r safety
\\ew.u.u.iun on these requests to amend the Technical Specifications is enclosed.
If you have any questions, please contact J. Lee (x27633), who is the METB reviewer for Grand Gulf, Unit No.1.
Daniel R. Muller, Assistant Director for Radiation Protection Division of Systems Integration
Enclosure:
As stated cc:
R. Mattson R. Capra W. Ganmill A. Schwencer D. Houston L. KIntner C. Willis J. Lee
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