ML20247N749

Special Rept 89-13:on 890328-29,specific Activity of Primary Sys Exceeded Limits in Administrative Procedure & Chemistry Control Commitment.Possibly Caused by Power Reduction.Isotopic Analysis Continued

ML20247N749
Person / Time
Site:	Rancho Seco
Issue date:	05/30/1989
From:	Keuter D SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
89-13, AGM-NPP-89-263, GL-85-02, GL-85-2, NUDOCS 8906060016
Download: ML20247N749 (6)

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)SMUD m.p l, SACRAMENTO MUNICIPAL UTILITY DISTRICT D 6201 S Street, P.o. Boxi15830, Sacramento CA 95852-1830.(916) 452 3211 L AN ELECTRIC SYSTEM'$ERVING THE HEART OF CALIFORNIA d@

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• AGM/NPP 89-263 ,G M i 31 May 30, 1989 U. S. Nuclear Regulatory Commission Attn: J. B. Martin, Regional Administrator Region V 1450 Maria Lane, Suite 210 Halnut Creek, CA 94596 Docket No. 50-312 Rancho Seco Nuclear Generating Station License No. DPR-54 SPECIAL REPORT NUMBER 89-13: FAILURE TO MAINTAIN SPECIFIC ACTIVITY OF THE PRIMARY SYSTEM HITHIN ADMINISTRATIVE LIMITS

Dear Mr. Martin:

The specific activity of the primary system exceeded the administrative limits specified in Rancho Seco Administrative Procedure RSAP-0222 and as committed to in our response to Generic Letter 85-02. The Sacramento Municipal Utility District hereby submits Special Report No. 89-13 in accordance with Rancho Seco administrative controls.

Members of your staff with questions requiring additional information or clarification may contact Mr. Jim Clark at (209) 333-2935, extension 4378.

Sincerely,

c. db Dan R. Keuter Assistant General Manager Nuclear Plant Manager Attachment cc w/atch: A. D'Angelo, NRC, Rancho Seco Document Control Desk, Washington DC 8906060016 890530 2

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RANCHO SECO NUCLEAR GENERATING STATION D 1444o Twin Cities Road, Herald, CA 95638-9799;(209) 333-2935

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• SPECIAL REPORT NUMBER 89-13 L .

Failure to Maintain Specific Activity of the Primary System Nithin Administrative Limits i:

<! Date of Occurrence March 28-29, 1989

' Plant' Conditions at Time of Occurrence

.The plant was at hot shutdown following a' trip on high pressure at 1515.

hours on-March 28.

Identification of Occurrence The specific activity of the primary system exceeded administrative limits as specified in Rancho Seco Administrative Procedure RSAP-0222, Rancho Seco Chemistry Control Commitment. The procedure requires the submission of a Special Report if the specific activity of.the primary coolant. is either greater than 0.8 pCi/ml I-131 or ~43/E pCi/ml.

Description of Occurrence For the period from approximately 1635 hours0.0189 days <br />0.454 hours <br />0.0027 weeks <br />6.221175e-4 months <br /> on March 28 to 0825 hours0.00955 days <br />0.229 hours <br />0.00136 weeks <br />3.139125e-4 months <br /> on March 29, while in a hot shutdown condition,' Reactor Coolant System sample data indicated thal specific activity was above -

0.8 pCi/ml I-131;'the 43/E limit was not exceeded. It is normal for iodine activity to increase for a short period of time after a power reduction. The District had committed to the 0.8 pCi/mi 1-131 limit via letter dated June.11, 1985, in response to Generic Letter 85-02.

Corrective Action Taken In accordance with RSAP-0222, on detection of the unusual condition, isotopic analysis continued until restoration of specific activity to within limits. .The analysis performed on March 29 at 0825 hours0.00955 days <br />0.229 hours <br />0.00136 weeks <br />3.139125e-4 months <br /> indicated that specific activity was below 0.8 pCi/ml I-131.

Per RSAP-0222 the following information is attached:

• Primary coolant specific activity and time duration when the activity exceeded 0.8 pCi/ml I-131 (Attachment 1).

• Reactor power history starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first sample in which the limit was exceeded (Attachment 1).

• Cleanup flow history stuting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first sample in which the limit was exceeded (Attachment 2).

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SPECIAL REPORT NUMBER 89-13

. Failure to Maintain Specific Activity of the Primary System Within Administrative Limits l

-Corrective Action Taken ,(Continued)-

• History of degassing operations, if any, starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first' sample in which the limit was exceeded. (No data is attached for this item because degassing operations were not performed during the period I-131' specific activity exceeded the limit.)-

• Fuel burnup~by' core region (Attachment 3).

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SPECIAL REPORT 89-13 Attachment 1

! . Failure to Maintain Specific Activity of the Primary System Hithin Administrative Limits POWER '

LEVEL PARAMETER DATE/ TIME (% Full Power) VALUE I-131 26-Mar-89 21:15 93.0 0.162 pCi/ml 27-Mar-89 20:15 92.9 0.163 pCi/ml 28-Mar-89 15:45 0.0 0.307 pCi/ml 28-Mar-89 16:35 0.0 1.58 pCi/ml 28-Mar-89 18:20 0.0 1.70 pCi/mi 28-Mar-89 21:20 0.0 1.33 pCi/mi 29-Mar-89 00:15 0.0 1.36 pCi/ml 29-Mar-89 04:25 0.0 1.04 pCi/ml 29-Mar-89 08:25 0.0 0.786 pCi/ml 29-Mar-89 12:45 0.0 0.442 pCi/ml

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- *' , SPECIAL REPORT 89 . Attachment 2 Failure to Maintain Specific Activity of the Primary System Hithin Administrative Limits t

b, - PARAMETER' -DATE/ TIME VALUE LETDOWN 26-Mar-89' 21:15 67 GPM.

FLOW 27-Mar-89 20:15 67 GPM 29-Mar-89 00:15 55.GPM 29-Mar-89 04:25 73 GPM 29-Mar-89 08:25 70 GPM L__. Z_______._.___ . . _ _ _ . _ _ _ . . .

o SPECIAL' REPORT 89-13 A*.'t.chment 3 L

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Failure to Maintain Specific Activity of the. i Primary System Nithin Administrative Limits t,

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1 BURNUP BATCH # # OF ASSEMBLIES (MHD/MTU) 1E 1 22,212 l SC 8 30,115 6B 16 30,355 7 32 26,444 i

8A 24 19,824 8B 40 19,388 9A' 16 7,445 l

9B 16 8,925 l

9C 16 9,020 l l

9D 8 8,931 -!

4 CORE AVERAGE = 18,773 MHD/MTU l I

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