ML18227D394
| ML18227D394 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 08/25/1978 |
| From: | Robert E. Uhrig Florida Power & Light Co |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18227D394 (5) | |
Text
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DISTRIBUTION FOR INCOMING MATERIAL 51 REC:
SCHWENCER A
NRC ORG,'HRIG R E FL PWR 8( LIGHT DGCDATE: 08/25/78 DATE RCVD: 09/01/78 DOCTYPE:
LETTER NOTARIZED:
NO COPIES RECEIVED
SUBJECT:
LTR 3 ENCL 3 FORWARDING EVALUATION PURSUANT TO REQUIREMENTS OF ORDER FOR MODlFICATION OF LIC DTD 08/02/77 ENTITLED: "REPT GF ABNORMAL INDICATIONS FROM METAL IMPACT MONITORING SYSTEM TURKEY POINT UNIT NO 4. "
PLANT NAME: TURKEY PT N4 REVIEWER INITIAL:
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DISTRIBUTION GF THIS MATERIAL IS AS FOLLOWS I
GENERAL DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LICENSE.
(DISTRIBUTION CODE A001)
FOR ACTION:
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0 h~...e FLORIDA POWER 84 LIGHTCOMPANY I
August'5,'"'978 L 78-278 I
f Office of Nuclear Reactor Regulation Attention:
Mr. A. Schwencer, Chief Operating Reactors Branch gl Division of Operating Reactors U.
S. Nuclear Regulatory Commission Washington, D. C.
- 20555
Dear Mr. Schwencer:
Re:
Turkey Point Unit 4
Docket No. 50-251 Metal Im act Monitorin S stem The Order for Modification of License for Turkey Point Unit No. 4, dated August 2, 1977, amended paragraph 3.D of License DPR-41.
Pursuant to the requirements of this Order, Florida Power 6 Light Company is for-warding the attached evaluation "Report of Abnormal Indications from Metal Impact Monitoring System, Turkey Point, Unit No. 4."
The indications occurred on August 13, 1978 during the unit cooldown for refueling.
Very t y yours, Robert E. Uhrig Vice President REU/RJA/mal I
Attachment cc:
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.REPORT OF ABNORMAL INDICATIONS FROM METAL XMPACT MONITORING SYSTEM (MIMS)
TURKEY POINT UNXT 4 August 13, 1978 On August 13, 1978, while Turkey Point, Unit 4 was cooling down for a scheduled refueling outage, the MIMS alarmed 6 times during a one hour period.
The 6 events were all
- separate, single, low energy indications.
No other alarms were experienced during the remainder of the cooldown.
Our review of the MXMS data concluded that the most prob-able cause of the alarms was normal acoustic emissions produced by the reactor vessel during periods of changing pressure and temperature.
Upon shutdown, tubesheet photographs of all 3 steam gen-erators verified that no tube plugs had become loose.
This information supported the conclusion that the indi-cations were not caused by loose parts.
However, if the assumption is made that the alarms were caused by a loose part(s),
the separate, low energy impacts indicate a
single object.
This is consistent with prior NIMS indi-cations on this unit.
This information, along with the continuing commitment of performing core barrel motion measurements after unit heat up, and for continued loose parts monitoring, ensures continued safe operation of Turkey Point Unit 4.