ML19317G933

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Proposed Amend 34 to Ol.Revises Tech Spec 2.3 Re Protective Sys Max Allowable Setpoints.Supporting Diagrams Encl
ML19317G933
Person / Time
Site: Rancho Seco
Issue date: 05/30/1975
From: Davis E
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
References
5972, NUDOCS 8004020589
Download: ML19317G933 (6)
v • d • e


Text

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NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORM)

CONTROL NO:

E FILE:

Sac amento, Calif.

F.K. Davis 5-30-75 6-2-75 XX TO.

ORIG CC OTHER SENT NRC PDR XXX A. Giambusso 1 Signed SENT LOCAL POR CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

XXXXX 1

50-312 DESCRIPTION:

ENCLOSURES:

Notarized Ltr. 5-30-75 trans the following....

Proposed Amdt to O/L changp to Tech Spec; con-sisting of Rev. to" Protective System Maximum Allowable Se tpoints"concerning Fig. 2.3-2.....

PLANT NAME: Rancho Seco

( 40 Encl. Rec'd)

FOR ACTION /INFORMATION VCR 6-2-75 BUTLER (L)

SCHWENCER (L) ZIEMANN tL)

REGAN (E)

W/ Copies W/ Copies W/ Copies W/ Copics CLARK (L)

STOLZ (L)

DICKER (E)

LEAR (L)

W/ Copies W/ Copics W/ Copies W/ Copies PARR (L)

VASSALLO (L)

KNIGHTON (E) sPIzs W/ Copies W/ Copies W/ Copies W/ Copies KNIEL (L) y PURPLE (L)

YOUNGBLOOD (E)

LPM W/ Copies WfCopies W/ Copies W/ Lopies INTERNAL DISTRIBUTION

/FFEG 6 f G TECH REVIEW DENTON LIC ASST A/T IND.

n riu FU H SCHROEDER GRIMES R. DIGGS (L)

BR AITM AN

[OGC, ROOM P.506A MACCARY GAMMILL H. GEARIN (L)

SALTZMAN GOSSICK/STAF F KNIGHT KASTNER E. GOULBOURNE (L)

MELTZ j CASE PAWLICKl BALLARD P. KREUTZER (E)

GIAMBUSSO SHAO SPANG LER J. LEE (L)

_ PLANS BOYD STELLO M. M AIGRET (L)

MCDONALD MOORE (L)

HOUSTON ENVIRO S. REED (E)

CHAPMAN DEYOUNG (L)

NOVAK MULLER M. SERVICE (L)

/ DUBE (Ltr)

SKOVHOLT (L)

ROSS DICKER S. SHEPPARD (L)

E. COUPE GOLLER (L) (Ltr)

IPPOLITO KNIGHTON / M. SLATER (E)

PETERSON P. CO L LINS TEDESCO YOUNGBLOOD H. SMITH (L)

HARTFIELD (2)

DENISE LONG REGAN S. TEETS (L)

KLECKER j,. R E G O P R LAINAS PR JECT LDR G. WILLI AMS (E)

EISENHUT FILE & REGION (2)

BENAROYA

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V. WILSON (L)

WIGGINTON MIPC VOLLMER HAR LESS R. INGRAM (L)

M. DUNCAN EXTERNAL DISTRIBUTION

/ James Hanchet 7 LOCAL PDR Sacramento, Calif.

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,,,,,,1 - TIC ( A B E R N AT H Y) (1)(2)(10)- NATIONAL LABS 1 - PD R. SAN /LA/NY Walnut Cre j 1 - NSIC (BUCHANAN) 1 - W. PENNINGTON, Rm E-201 GT 1 - BROOKHAVEN NAT LABCali 1 - ASLB 1 - CONSULTANTS 1 - G. ULRIKSON ORNL 1 - Newton Anderson NEWM ARK /B LUME/AG B ABI AN

/fACRS HOLDING /SENTM dd 8004020 T Q [

)SMUD SACRAMENTO MUNICIPAL UTILITY OlSTRICT C 1708 59th Street, Box 15830, Sac smento, California 95813:(916) 452 3211

.g '.

N/

2 May 30, 1975

,6[ 6 k,i SIT 4%~ tyy Mr. Angelo Giambusso g

-Q 0.<.

Director for Reactor Licensi".g e\\

Division of Reactor Licensing

' i & ;9

Nuclear Regulatory Commission Washington, D. C. 20545

-W Re: Abnormal Occurrence Report No. 75-8 Submitted May 7, 1975 to Mr. Angelo Giambusso

Dear Mr. Giambusso:

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.imendment No. 34.

The Proposed Amendment No. 34 contains a change to the Rancho Seco Unit No. 1 Technical Specifications concerning Figure 2.3-2 " Protective System Maximum Allowable Setpoints".

As discussed in the referenced document, during a review of the Rancho Seco RPS flux / imbalance / flow limiting safety system settings, defined in Technical Specification 2.3, an error was found in the pos-itive imbalance portion of the trip envelope (see Figure 1).

The cal-culations were being reviewed to determine consistent setpoints for a RPS-Il module to be placed in service at the Raricho Seco site.

The error was a misreading of one point of the offset versus power limits during the conversion of the core axial offset to core axial im-balance. As can be seen in Figure 1, the corrected imbalance limits (with the appropriate instrumentation and calibration errors included) fall inside the positive imbalance limiting safety system setting currently defined in the Rancho Seco Technical Specifications.

The horizontal portion of the flux / imbalance / flow envelope represents the flux to flow ratio which protects the unit against violating the DNB criteria for loss of flow accidents.

The sloped portions of the envelope represent reductions in the allowable flux to flow ratio for core axial imbalance.

This portion of the envelope protects the unit against steady state imbalance conditions which could result in central fuel melting.

Figure i shows the flux / imbalance / flow envelope currently in the Rancho Seco Technical Specifications, with the corrected positive imbalance versus power limits.

Figure 2 shows the interim flux / imbalance / flow trip settings used as reported in A0-75-8 until the revised envelope could be to71 defined. Also shown in Figur; 2 is the Operational Power Imbalance Enve-

Angelo Giambusso May 30, 1975 lope from Figure 3.5.2-2 of the Rancho Seco Technical Specifications.

Figure 2 3-2 shows the recommended revision to the Rancho Seco flux /

imbalance / flow limiting safety system settings.

The speci fic parameters associated with this Figure are:

By = -40.0, B = -17.1, B = +7.74, 2

3 B4 = +25.0, M; - +0.906 and M = -2.03 2

As can be seen by comparison of the three figures described above, the interim flux / imbalance / flow envelope represents the most restrictive RPS settings and is presently in effect for Rancho Seco. The Operational Power imbalance Envelope shown on Figure 2 lies entirely within the inter-im RPS settings.

The Operational Power imbalance Envelope has not been exceeded by positive imbalance during normal operation at Rancho Seco as was stated in detail in A0-75-8.

B&W informed SMUD of the error in the Rancho Seco Technical Speci-fication limiting safety system settings immediately upon the determi-nation that an error did exist. A very conservative interim positive imbalance limit (Figure 2) was reviewed by the safety committies on April 29, 1975 and remained in effect until the corrected positive imbalance portion of the envelope was developed.

SMUD implemented the interim positive imbalance trip settings and informed the NRC Regional Office of the problem and the actions taken on the same day, April 29, 1975 B&W has provided SMUD with the corrected flux / imbalance / flow envelope and this information is being submitted as Figure 2.3-2 as Proposed Change No. 34 to the Rancho Seco Unit 1 Technical Specifications.

Respectfully submitted, SACRAMENT IC PAL UTILITY DISTRICT

'A f

h Ry n

e General Manager

/

bo bl DAV ID S. KAPL

~

General Coun I of Sacramento M nicipal Utility District

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Subscribed and sworn to before me this CM "I '

30th day of May, 1975 g

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mo Betty Mattier, Notary Public in and for the County of Sacramento, State of O' rg California f pp.,

/ My Commission Expires January 12, 1976 N/94 gspigts

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RANCHO SECO UNIT 1 PROTENE SYSTEM MMIMUM TECHNICAL SPECIFICATIONS ALLOWABLE SET POINTS CHANGE,,[,]

l SMUD FSAR - 615 i

SACRAMENTO MUNICIPAL UTILITY DISTRICT l

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