ML19326A804
| ML19326A804 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 08/03/1978 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Stewart W FLORIDA POWER CORP. |
| Shared Package | |
| ML19326A801 | List: |
| References | |
| NUDOCS 8003040761 | |
| Download: ML19326A804 (4) | |
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August. 3,1978 -
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VStello Docket No.: 50-302
......._......BGrimes RRei.d Cilelson RIngram Attorney, OELD Florida Power Conoration
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~ ATTN: Mr. W. P. Stewart
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Director, Power Production.......IBAbernathy_.-......
P. O. Box 14042, Mail Stop C-L........ _JItBuchanan; St. Petersburg, Florida 33733....._. ACRS (16)...
j TCarter Gentlemen:
.... _ R Gray Fil e We have reviewed your July 7,.]970. submittal.regarding Decay Heat..........
Pump-1A shaft failure and haveJetermined.that.the. additional information listed in the enc]osure.is necessary to continue.our..
revicw. This information should.be,,suhnitteff.as.scon.as.possible.
Sincerely,
- q S Robert W. Feid, Chief Operating Reactors $ ranch E4,.
Division of Operating Reactors..
Enclosure:
Request for Additional Infor: nation cc w/ enclosure: See next pa d,,..,.._,,-..,..,...... ~.
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cc: Mr. S. A. Brandimore Vice President and General Counsel P. O. Box 14042 St. Petersburg, Florida 33733 Crystal River Public Library Crystal River, Florida 32629 i
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y REQUEST FOR ADDITIONAL INFORMATION CRYSTAL RIVER 3 DHP-1 A SHAFT FAILURE 1.
Additional assurance is needed that the corrective action proposed for DHP-1A will restore the ability of this pump to perform its intended function.
Therefore testing in the following areas is requested:
(1)
Verification that the minimum required flow and head characteristics are maintained.
(2) Verification that impeller rubbing has been eliminated and that excessive vibration levels do not exist at flow rates at which this pump may operate.
This should be accomplished using accelerometer data taken from the bearing housing in the velocity mode, to ascertain peak values at various frequencies, and demodulated acceleration data taken for the pump casing, to ascertain the degree of pump rubbing or impact with the stationary wear rings or casing.
(3) A thorough inspection of the pump at the conclusion of testing.
Please inform us, within seven days from the cate of this letter, of the tests of DHP-1 A that you ir. tend to perform.
It will be necessary for us to review the results of these tests prior to restart of CR-3.
2.
What is the maximum time that the decay heat pumps must operate in the recirculation mode following a loss of coolant accident and approximately how long had DHP-1 A operated in the recir-culation mode prior to the most recent failure?
3.
Provide the infonnation or data which supports the revised restrictions for operation at minimum or recirculation flow rates.
4.
In order to facilitate our review of DHP-1 A and the corrective actions to be taken, please provide detailed engineering drawings of the DHP showing critical dimensions.
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Because a similar but less severe misalignment between impeller and casing on DHP-1B is not precluded by its operating history and because inspection of the previous DHP-1B shaft at the time of its replacement " revealed indications that could be inter-preted as initiation of fatique damage" (B&W Preliminary Significant Deficiency Report 5-77, May 3,1977), you are requested to-verify by inspection proper alignment between the DHP-1B l
impeller and casing and report the results of this inspection.
Please inform us, in your seven day response-to question 1, of your intent with respect to inspection of DHP-18.
You are also requested to provide the pump signature of DHP-1B which you 1
refer to in your letter.
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