ML20002A417

Control Rod Surveillance Program:Increased Drop Time Control Rod 19

ML20002A417
Person / Time
Site:	Yankee Rowe
Issue date:	06/14/1972
From:	YANKEE ATOMIC ELECTRIC CO.
To:
Shared Package
ML20002A416	List: ML20002A415 ML20002A417
References
PROC-720614, NUDOCS 8011170155
Download: ML20002A417 (4)

Text

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knwyayp:t6 I'l~7A CO.NTROL ROD SURVEILIANCE PROGRAM IhCREASED DROP TIhE CO.NTROL ROD NO. 19 G. CARL ANDOGNINI YANKEE ATOMIC ELECIRIC COMPANY lEST50RO, FRSSACHUSEITS JtEG 14, 1972 6 011170/$7

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The reactor control rod surveillance program required that the plant be taken off-the-line on the weekend of June 10-11, 1972 to measure control rod drop times. Due to a hydrogen leak in the main' electrical generator and electrical dispatching requirements, the plant was taken off-the-line on June 8, 1972.

Not as a part of the surveillance requirement, but for information purposes only on June 9,1972, all control rod drop times were n.fured.

Results from the drop time measurements indicated all control rods were functioning norna11y, including control rod No. 18 which dropped in 2.56 seconds. Control rod No.18 has successfully dropped 10 of the last 10 times it has been dropped.

It's average urop time is approximately 2.68 seconds.

In connection with a repair on the primary plant, on June 9,1972, the primary systen was cooled down to approximately 400 F and subsequent to the repair returned to the normal 514*F Tavg.

On June 10, 1972 the control rod drop times were measured as part of the AEC approved surveillance program. Results from the surveillance test indicated that control rod No. 19 had increased from the drop time measured on Friday, Ju.e 9, 1972 and had exceeded the highest of the three start-of-life baselir.e drop times by more than 0.3 seconds. On Friday, June 9,1972 control rod No. 19 dropped in 1.96 seconds; on Saturday, June 10, 1972 control rod No.19 dropped in 2.23 seconds and 2.25 seconds respectively.

The highest of the three start-of-life baseline drop times was 1.90 seconds.

The 0.3 seconds is part of the acceptance criteria established with the AEC in conjunction with the surveillance program and an increase in any control rod drop tire by 0.3 seconds from the highest of the three start-of-life baseline drop tires is sufficient cause to pro.ptly notify the AEC and submit

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a follow-up report. Mr. A. Burger of the AEC was notified by G. C. Andognini on June 12, 1972.

Since the 2.40 second drop time limit had not been exceeded and the control rod drop measurements on control rod No. 19 were repetitive, upon completion of the electrical generator repairs the plant was phased on-the-line June 11, 1972.

The next scheduled portion of the control rod surveillance program is scheduled for the weekend of July 1-2, 1972. At this time the control rod drop times for all control rods will be measured and reviewed in detail.

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AEC DISPRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORM)

COIiTROL NO:

3331 FROM: Yankee Atomic Elec. CompanyDATE OF DOC:

DATE REC'D LTR ZEMO RPl' OTHER Westboro, Mass.

01581 L.H. Heider 6-14-72 6-19-72 X

N TO:

ORIG CC OTHER SEI;T AEC FDR 1 signed 2

SENT LOCAL PDR DRL CLASS:

? ROP IIiF0 INFUT NO CYS REC'D DOCKET IiO:

3 50-29 DESCRIPTION:Ltr trans the following:

ENCLOSURES: REPORT-Control Rod Surve111ance Program Increased Drop Time Control Rod No. 19 dtd 6-14-72....

(3 cys enc 1 rec'd)

PLAIiT IaZGS: Yankee Atomic Elec. Co.

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