ML20030A358
| ML20030A358 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 07/03/1974 |
| From: | Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8101090393 | |
| Download: ML20030A358 (3) | |
Text
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Company General Offices: 212 West Michigan Avenue. Jackson, Michigan 49201. Area Code S17 788-O* 50 s
July 3, 1974
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Mr. John F. O' Leary, Director Re: Docket 50-155
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.q ' ; f Directorate of Licensing Proposed Technical
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US Atomic Energy Commission Specifications C1ange -
Washington, DC 205h5 Amendment to License DPR Big Rock Point
Dear Mr. O' Leary:
Erratum Sheet On June 28, 197h we transmitted to you a request for a propor,ed change to the Technical Specifications for our Big Rock Point Plant. There was an omission on Page 3 (fourth line, next to last word, the word "tvo" was omitted). The corrected page is attached.
Would you please have your copies corrected.
Yours very truly, W C' v
RBS/mel Ralph B. Sevell Nuclear Licensing Administrator CC:
JGKeppler, USAEC Y
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3 Rev 7/3/Th Purther testing will be performed during the next operating cycle. At each cold shutdown, all blades with rollers removed will be friction tested and the results compared with previcus test results to
. detr,rmine if trends exist. At the next refueling outage, at least two blades and their surrounding channels will be inspected for signs of wear.
During the recent attempt to start up for power operation on June 5,197h, Control Rod C h became stuck in the fully inserted position in the core. An inspection disclosed that a roller was lodged between the. index tube and housing extension of Control Rod Drive C-4.
Further j
inspection determined that the roller came from Control Rod D-6.
Control
- Rod D-6 was one of the control rods which had a lower roller previously missing and is located adjacent to Control Rod C-6.
This is the area apparently which sees the highest local flow turbulence since a number i
of lower roller *
- nave been lost from these two control rods in the past.
1 It was also noted through the inspection of Control Rod D-6 that a third roller vas loose and ready to fall out.
Further inspection of the control rods disclosed a lower roller missing from Control Rod B-1.
The roller was retrieved from the bottom of the reactor vessel.
Since the number of operations that has occurred on Control
' Rod C 6 since the beginning of Cycle 12 closely approximates the number of cycles anticipated through the end of the cycle scheduled to end in 1975, and no abnormalities were noted, it is requested that the lower rollers on the remaining outer periphery control rods be removed during this outage. The loss of a roller does not cause any safety implica-tions since it cannot prevent the insertion of a contrcl rod. However, should a loose roller become lodged between the control rad drive housing extension and index tube, it would prevent withdrawal of the control rod and could severely limit power output.
Conclusions j
Based on the foregoing, both the Big Rock Point Plant Review l
Committee and the Safety Audit and Review Board have concluded that 1
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l AEC..,...I EUTI O I TOR PART 50 DOCKET M,m.iAL (Ti2tPORARY FORM)
CONTROL N0:
FILE: Aff' FROM:
DATE OF DOC DATE REC'D LTR TWX RPT OT!IER Conzumors Power Conpany J clson, Mich. 49201 Mr. R.B. Sewell 7-3-74 7-8-74 X
TO:
- ORIG, CC OTHER SENT AEC PDR XXX SENT LOCAL PDR__ XxX J.F. O' Leary 1 signed CLASS UNCLASS PROP INFO INPUT NO CYS REC'D DOCKET NO:
XXX 40 50-155 DESCRIPTION:
ENCLOSURES:
Ltr re their 6-28-74 subnittal....trans the Correction to the Proposed chance to Tech following......
Specs......
ACKNOWLEDGED (40 cyn enc 1 rec'd)
DO NOT REMOVE PLANT NAME:
Big Rock Point FOR ACTION /INFORMATION 7-10-74
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INTERNAL PISTRIL'ITION
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PLANS GIAMBUSSO PAWLICKI SPANGLER KREUTZER (E)
MCDONALD BOYD Si!AO LEE (L)
CHAPMAN MOORE (L)(WR)
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KLECKER DENISE TEDESCO REGAN SMITH (L)
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