ML19317G657
| ML19317G657 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/07/1975 |
| From: | Davis E, Kaplan D SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| References | |
| NUDOCS 8003250712 | |
| Download: ML19317G657 (3) | |
Text
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NRC DIST 'CUTION F_OR PART SC_DOCXET t' TERI AL (TEMPOR ARY FORM)
' CONTROL NO:
. 3988 FILE:
FROM: SMUD DATE OF DOC DATE REC'D LTR TWX RPT OTHER 3acramento, Calif. 95813 4-7-75 4-12-75 XX 3x %.m TO:
ORIG CC OTHER SENT AEC PDR vt tii. A. Giambusso 1 signed 29 SENT LOCAL PDR Pr CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
x:oc 30 50-312 DESCRIPTION:
Ltr notarized 4-8-75 trans the ENCLOSURES:
Addendum to Rancho Seco Unit 1 Proposed Andt #29 to the Tech Specs....
following:
(30 cys encl ree'd)
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PLANT NAME:
Rancho-Seco Unit 1 FOR ACTION /INFORMATION DHL 4-14-75 BUTLER (L)
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BRAITMAN edGC, ROO.'.1 P-50GA MACCARY GAMMILL H. GE APIN (L)
SALTZMAN MOSSICK/ STAFF KNIGHT KASTNER E. GOULBOURNE (L)
ME LTZ CASE PAWLICKI BALLARD P. KREUTZER (E)
GIAMBUSSO SHAO SPANG LE R J. LEE (L)
PLANS DOYD STELLO M. MAIG RET (L)
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EISENHUT M-ILE & REGION (2)
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6201 S Street, Box 15830, Sacramento, California 95813; (916) 452 321 April 7, 1975 Mr. Angelo Giambusso Director for Reactor Licensing Division of Reactor Licensing Nuclear Regulatory Commission Ob Washington, D. C. 20545 Re:
NRC Docket No. 50-312, Letter Submitted December 6,1974
" Proposed Amendment No. 29 to Rancho Seco Nuclear Generating Station, Unit No. 1"
Dear Mr. Giambusso:
In accordance with 10 CRF 50.59, the Sacrament District is submitting Addendum No.
o Manicipal Utility 1 to the above referenced amendment.
cerning the ejected rod worth and contains the follThis a ce with the NRC con-owing change:
1)
Section 3.1.3.5 had the last sentence added to "Following safety rod withdrawal, the
- state, regulating rods shall be positioned within their position limits as defined by specif1-cation 3.5.2.5 prior to deboration."
Respectfully submitted, SACRAMENTO MUNICIPAL UTILITY DISTRIC By I
[. h General Manager D,'ID S.' KAPfli
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G neral Counse of Sacramento Municipal Uti y-District
)ER, NOT4 ubscribed and sworn to before me this 4
h day of April, 1975 u.hk.
3%LLA
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B :ty MattierhNotary Public in and for
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t e County of Sacramento, State of lifornia Je t04 *#
My Commission Expires January
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tantS p, 12, 1976 A ?4 ELECTRIC S Y S T E 'J S E RVIM l
O RANCHO SECO UNIT 1 TECHNICAL SPECIFICATIONS Limiting Conditions for Operation 1.1.3 MINUMUM CONDITIONS FOR CRITICALITY d -]-
Specifications 3.1.3.1 The reactor coolant temperature shall be above 525 F except for portions of low power physics testing when the requirements of Specification 3.1.8 shall apply.
3.1.3.2 Reactor coolant temperature shall be above DTT + 10 F.
3.1.3.3 When the reactor coolant temperature is below the minumum tempera-ture specified in 3.1.3.1 above, except for portions of low power physics testing when the requirements of Specification 3.1.8 shall apply, the reactor shall be suberitical by an amount equal to or greater than the calculated reactivity insertion due to depressurization.
3.1.3.4 The reactor shall be maintained subcritical by at least 1 percent Ak/k until a steam bubble is formed and an indicated water level between 10 and 316 inches is established in the pressurizer.
3.1.3.5 Except for physics tests and as limited by 3.5.2.1 and 3.5.2.5, safety rod groups shall be fully withdrawn prior to any other reduction in shutdown margin by deboration or regulating rod withdrawal during the approach to criticality.
Following safety rod withdrawal, the regulating rods shall be positioned within their position limits as defined by specification 3.5.2.5 prior to deboration.
Bases At the beginning of life of the initial fuel cycle, the moderator temperature coefficient is expected to be slightly oositive at operating temperatures with the operating configuration of control rods. (1) Calculations show that above 525 F the positive moderator coefficient is acceptable.
Since the moderator temperature coefficient at lower temperatures will be less n:gative or more positive than at operating temperature,(2) startup and opera-tion of the reactor when reactor coolant temperature is less tan 525 F is pro-hibited except where necessary for low power physics tests.
Tha potential reactivity insertion due to the moderator pressure coeffi-cicnt(2) that could result from depressurizing the coolant from 2185 psia to caturation pressure of 885 psia is approximately 0.1 percent Ak/k.
During physics tests, special operating precautions will be taken.
In addi-tiin, the strong negative Doppler coefficient (1) and the small integrated Ak/k would limit the magnitude of a power excursion resulting from a reduc-ti:n of moderator density.
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