ML20049J507

LER 81-033/01X-1:on 811228,error in Tech Specs Heatup & Cooldown Curves Determined to Be Reportable.Caused by Calculational Mistake & Not Revised Due to Administrative Error.Corrected Curves & Calculations Will Be Submitted

ML20049J507
Person / Time
Site:	Robinson
Issue date:	03/02/1982
From:	Gilman F CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20049J503	List: ML20049J502 ML20049J507
References
LER-81-033-01X, LER-82-33-1X, NUDOCS 8203180287
Download: ML20049J507 (2)

Text

NRC F ORM 366 U. S. NUCLE AR REGULATCY COMMISSION U 11)

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7 5 60 68 DOCKET NUMBER b6 69 EVENT DATE HEPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 lon December 28, 1981, it was determined that an error in the Technical Specification 1 o 3 lheatup and cooldown curves which had not been reported to the NRC was reportable l o 4 l pursuant to Technical Specification 6.9.2.a.9. This error was made in 1977 and, due l o s lto an administrative error, was not reported to the NRC. While this error does result l O o lin a non-conservative shift in the curves near their end of applicability (20 EFPY of l 0 y l vessel exposure), the error does not represent non-conservative operation for the l current exposure (7.4 EFPY); therefore there is no threat to public health and O a l safety from this event. l COEE Co"Df she*COoE COMPONENT CODE SUSCOOE S C DE Q

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33 34 3b 3/ 40 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O lThe heatup and cooldown curves were in error due to calculational mistakes and were notl i i l revised due to an administrative error. The corrected curves and calculations will be I i 7 l submitted to the NRC upon final resolution of the calculational mistakes. The l i a l administrative error is considered a unique and isolated event. A similar event l should be precluded by changes made to our administrative practices since 1977, t 4 lchances which have increased our awareness of the status of Tiroiects beine coordinated 1 l 7 a s 80

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F SUPPLEMENTAL INFORMATION FOR

-LICENSEE EVENT UPDATE REPORT 81-033

1. Cause ' Description and Analysis On December 28, 1981, it was determined that an error in the Technical

- Specification heatup and cooldown curves was reportable pursuant to Technical Specification 6.9.2.a.9.

A recent review of informa tion rela ted to the Reactor Vessel Ma terial Surveillance Program for H. B. Robinson Unit No. 2 revealed a calculational error in analyses used to update heatup and cooldown curves pursuant to Specification 3.1.2.4. This information was reported to Carolina Power and Light Company in April,1977, by the contractor who performed the analyses. - However, through ~ an administrative error, the revised information was never reported nor incorporated in Technical Specifications as required by Specification 3.1.2.4.a and b. . LThe error results in a slight shif t (5*F) to the right in Technical Specification figures 3.1-1 and 3.1-2. The current figures therefore.could have resulted in operation above the revised curves as plant lifetime approached 20 effective full power years (EFPY), the period for which the figures are applicable. _ However, it has been verified that due to the current accumulated exposure (approxima tely 7.4 EFPY) the curves now existing in Technical Specifications remain very conservative. Therefore, this event does not constitute a threat to public health and safety.

2. Corrective Action A verification was made to insure that the existing curves, although slightly in error, would not result in non-conservative operation.

Investiga tion is continuing into the cause of the calculational error. In addition, a complete review of the contractors surveillance program is underway and revised heatup and cooldown curves will be submitted to NRC upo,n, verification of their accuracy.

3. Corrective ' Action to Prevent ' Recurrence

, This event occurred several years ago and is believed the result of a -

l unique set of circumstances rela ted to re-assignment of responsibility for coordination of this project of fsite. It is therefore considered to be an isola ted event. In addition, since 1977, changes have been made to administrative practices regarding of fsite coordinated projects and an increased awareness of the status of these activities has resulted. Accordingly, no further corrective actions are considered necessary.

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