ML19329B608
| ML19329B608 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/17/1977 |
| From: | Knop R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML19329B601 | List: |
| References | |
| NUDOCS 8002050727 | |
| Download: ML19329B608 (2) | |
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GLEN ELLYN. ILLINott 60937 O
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March 17, 1971 Docket No. 50-346 D
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v MEMORANDUM FOR K. V. Seyfrit, Chief, Reactor Techical Assistance Branch Office of Inspection and Enforcement, Headquarters THRU:
. Fioralli, Chief', Reactor Operations and Nuclear Support Branch FROMt R. C. Knop, Chief, Reactor Projects Section 1
SUBJECT:
DAVIS-BESSE UNIT 1 VIBRATION TESTINC (F30273H1)
During the past several months, two meeting
- involving NNR I&E, and TECO have been conducted relative to the proposed fix of the Davis-Besse Core internals.
Unfortunately, the tubj ect of post fuel loading vibration monitoring of the core barrel and cionitoring of loose parts were not dis-cussed.
On March 10, 1977, we were informed by the licensee that the power ascension test for the Loose Parts Monitor was being cancelled and a surveillance test was being substituted.
On March 14, 1977, an inspector reviewed the status of the loose part monitor capabilities. The following was determined:
1.
No calibration of the installed =onitors involving kncun impact forces has been done. The licensee is now considering doing some testing.
2.
Adjustment of filters for each accelerometer threshold under simulated and/or operating conditions has not been done.
3.
The equipment was operating during the hot functh =?, 'out no correlation was made with the B&W data nor is there any data available at the site to make a correlation now.
It appears that there is a nominal 9 Ez spike in the data during the early stages of hot functional testing at warm conditions of 385 F and 1500 psig. This 9 Hz signal became less pro-nounced on the lower vessel acceleroceters and was not defined by the upper vessel detectors during hot conditions of 530 F and 2170 psis.
However, the sensitivity of a 9 Hz move =cnt on a 0-512 H: scale is so small that the 9 Hz spike is close to the D.C. roll off.
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o K. V. Seyfrit 2
March 17, 1977 4.
The cancelled power ascension test of the loose parts monitor was to be conducted during varions punp and valve configurations to establish a baseline spectra.
The surveillance test to be substituted in place of the power ascension test would merely call for turning on the machine and reviewing the data for differences between takes.
5.
The licensee does not currently intend to do any vibration monitoring other than that which can be detected by the installed loose parts monitor.
Because there is no assurance possible that the licensee is able to obtain 20 mils i 5 clearance between each side of th'. J lugs and of the core barrel blocks, the region feels it is necessary r.
closely monitor vibration data of the reactor vessel during the post fuel loading period.
It is the recommendation of Region III that the 1.icensee should:
1.
Perform sufficient ~ calibration, reflex tests, filter gain adjustments, etc., on the loose parts monitor (1.PM) to assure that it is functioning as intended prior to core loading.
2.
Perform a formal test program to adequately establish base Ifne data for the IJM during post fuel loading.
3.
Provide his rationale on any supplemental testing required to prove that the core barrel fix agreed to during the March 10, 1977 NRR neeting is doing the job.
This vould include an analysis of how he will deter-mine that core barrel damage, by i=pseting with it's subsequent cold working, is not taking place.
It is requested that your office determine an official I&E position relative to this matter end provide any required coordination with NRR.
Since the licensee indicates he will be ready to load fuel on or near March 25, 1977, we request that this matter be given priority censideration.
Should you have any further questions, please feel free to contact R. J. Cook, or myself.
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R. C. Knop, Chief Reactor Projects Section 1 cc:
E. H. Grier, IE:HQ H. D. Thornburg IE:HQ C. W. Roy, IE:HQ R. F. Warnick, Regional Coordi:.ator IE Files Central Files J. G. Keppler, Director D
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- 1. J. Cook (l
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j D. Thompson IE:HQ UO j