ML17345B290
| ML17345B290 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 09/26/1983 |
| From: | Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Rahe E WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| Shared Package | |
| ML17345B286 | List: |
| References | |
| NUDOCS 8310060190 | |
| Download: ML17345B290 (4) | |
Text
I'lr. E. P.
Rahe, tanager Nuclear Safety Department Nuclear Technology Division Westinghouse Electric Corporation Box 355 Pittsburgh, PA 15230
Dear Ilr. Rahe:
Subject:
Case Study Report - Low Temperature Overpressure Events At Turkey Point Unit 4 On November 28 and 29, 1981 dur ing the filling and venting process while restarting the reactor after a refueling outage, two overpressure events occurred at Turkey Point Unit 4 which exceeded by a factor of tee the technical specification limits.
Both trains of the overpressure protection systen were inoperable and operator actions were required to mitigate the pressure transients to prevent a more severe pressure excursion.
The safety significance of the events is the possibility of the reactor vessel failure by brittle fracture as a consequence of the overpressure transients dur ing low temperatur e operation.
These overpressur ization transients were the first events to occur at an operating pressurized water reactor which exceeded the technical specification limits since the HRC staff resolved the generic issue of low temperature overpressure transients in 1979.
The events were identified to Congress as Abnormal Occurrences which indicate that the events involved a major reduction in the degree of protection to the public health and safety.
Because of the safety significance of the
- events, AEOD performed a detailed case study of the event sequences, the causes and the corrective actions taken, and the generic implications of the events.
A preliminary report, of our investigation is enclosed.
The purpose of this letter is to provide you with the opportunity to review the report, particularly with regard to its completeness and accuracy, prior to the issuance of the AEOD final report.
Changes to the findings, con-clusions and recommendations will be considered only if the underlying information concerning the details of plant design, systems operation or event sequence is in error.
Therefore, comments are being solicited on the technical accuracy of the report.
The findings, conclusions, and recommen-dations are provided for your information in order that you understand the significance AEOD places on this event and therefore obtain a more complete picture of the total report.
We would welcome your comments either informally by phone or formally by letter.
Since we wish to finalize and issue the report shortly, we ask that an comments ou ma wish to make be brou ht to our attention within o icg~
30 days f om receipt o
this letter.
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As you may kno>I, AEGD-reports do not represent an official HRC position or the position of the responsible IIRC. program office.
Our.reports are one input to an ongoing review. and evaluation process, and any recemaendation contained in our final repor t vfll be considered and perhaps modified or eliminated by the responsible IIRC office.
A copy of the preliminary report and this letter are being placed in the Public Document Room at 1717 kl Street, N.M., Washington, D.C.
20555.
1f you have any questions regarding this matter, please feel free to contact Itayne Lanning of my staff.
Ilr. Lanning can be reached at 301/492-4433.
Sincerely,
Enclosure:
.As stated C. J. Heltemes, Jr., Director.
Office for Analysis and Evaluation of Operational Data cc: Greta Harkness Distribu ion D
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