ML19319E014
| ML19319E014 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/04/1976 |
| From: | Kaplan D, Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| Shared Package | |
| ML19319E015 | List: |
| References | |
| NUDOCS 8003270777 | |
| Download: ML19319E014 (3) | |
Text
.
NRCacpM 195 u.s. NUCLE AR GECULATOGY CC
- tSSloN DOCKET NUM ER
- n. m 50-312 NRC Dl'STRIBUTION roR PART 50 DOCKET MATERI AL TO:
FROM:
oATE os ooCUMENT Sacramento Municipal Utility Dist.
3gf3f74 Mr. Robert ". Reid Sacramento, California DATE RECEIVE D J. J. Mattimoe loh W XLETrEn SN oTORIZ E D PROP INPUT FORM NUMBER OF COPIES RECEtVED MoR OINAL
$DJNCLASSIFIE D One signed CCory 39 copies encl reevd.
DESCRIPTION ENC OSURE Ltr. no torized 10/8/ 76..... trans, the following:
Amdt. number 44 to ol/ change to tech
' specs for license DPR-54 for Rancho Seco, unit no. 1.
DO NOT REM 0yg ACKNOWLEDGED PLANT NAME:
(2-P)
(2-P)
Rancho Seco SAFETY FOR ACTION /INFORMATION ENVTRO 10/13/76 RJL ASCICNED AD:
A99TCNTn Ana s
M BRANCH CHIEF:
Reid
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BRANCH CMTEF.
M PROJECT MANAGER:
Rooney PROJECT MANAGERr K LIC. ASST.:
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INTERNAL DISTRIBUTION hTLEG FID SYSTEMS SAFETY PIANT SYSTEMS SITE SAFETY &
YNRC PDR HEINEMAN TFnFRCQ ENVIRO ANALYSIS VI&E (W)
SCHROEDER BENAROYA DENTON & MUTIER
)M ELD s 1AINAS COSSICK & STAFF ENGINEERING IPPOLITO ENVIRO TECH _
MIPC MACCARRY KIRE!QQD ERNST CASE KNIGilT EALLARD ltANAUER SIllWEIL OPERATING REACTORS SPANCTER
_JARLFJS PAWLICKI STELLO ATTP TFEH; PROJECT MANAGEFENT REACTOR SAFETY OPERATING TECH.
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BUTLER SITE ANALYSIS MELTZ V
CRIMES VOLIJER
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October g.
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L Director of Nuclear Reactor Regulation
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Attention:
Mr. Robert W. Reid, Chief
,f Operating Reactors, Branch 4
.N U. S. Nuclear Regulatory Commission Washington, D. C.
20555
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Docket No. 50-312 i.
Proposed Amendment No. 44 4.1 Rancho Seco Nuclear Generating Station, Unit No. 1
/
Dear Mr. Reid:
In accordance with 10 CFR 50.59, the Sacramento Municipal Utility District hereby proposes to amend its Operating License DPR-54 for Rancho Seco Nuclear
. Generating Station, Unit No. 1, by submitting forty (40) copies of Proposed Amendment No. 44.
The Technical Specifications Figures 3.5.2-1 and 3 5.2-2 are being amended because the initial calculations performed for the tech specs were based on the design assumption that Rancho Seco would be operating at or near optimum imbalance conditions during normal operation prior to any extreme or sudden control rod movement.
The magnitude of control rod movement (within the predescribed limits) would be limited by the imbalance it would produce.
if the imbalance approached the allowable Imbalance limits, the operator would be forced to compensate with the control rods which were Just moved or be in danger of tripping the plant.
Present design philosphy which has evolved during recent reload work differs slightly in that it is now assumed that the operator makes either of two improbable mistakes; the plant is either placed in a bad offset condition using APSRs with the operator overcompensating using control rods, or the control rods and APSRs are moved in a tenuous manner (i.e., alternating movement between the two groups) such that the plant is somchow maintained within the imbalance limits and RPS limits.
While such cases do not violate RPS limits, it may be possible to produce peaking which would exceed LOCA limits at some extreme loca-tion in.the core.
Thus, the present operating limits have been modified to pre-clude even this_ improbable circumstance.
. Amendment No. 44 represents an approach to LOCA operational limits which is more conservative than previously used. Whereas the previous analysis was tailored more toward RPS protection, it did contain inherent conservatisms which have been extended in the present design technique.
Previous limits assumed (as do present limits) that the control rods and APSRs remained in a constant position during the depletion prior to the rapid movement which caused the adverse peaking.
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' o Robert.W. Reid, Chief Operating Reactors, Branch 4 October 4, 1976 Additionally, the rod movement was assumed to be instantaneous, thereby taking no credit-for slow' withdrawal and xenon buildup in the freshly uncovered fuel.
If we can provide additional information please contact us.
Respectfully submitted, SACRAMENTO MUNICIPAL UTILITY DISTRICT 1.4N By
{d.h.Mattimoe Assistant General Manager and Chief Engineer 9
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. Dpi d S. ' Ka p Gdneral Couns I for Sacramento Mu icipal Utility District.
Subscribed and sworn to before me this MER* Nkpt @ day of October,1976.
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LC[k_f E
A k
9[t J tty Mattlei\\, Notary Public in and g
or the County of Sacramento, State
%% c o-4 of California My Commission Expires January 12, 1980 f
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