ML20136B527
| ML20136B527 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/20/1979 |
| From: | Pletke L BABCOCK & WILCOX CO. |
| To: | Denise Wilson GENERAL PUBLIC UTILITIES CORP. |
| References | |
| NUDOCS 7909060473 | |
| Download: ML20136B527 (6) | |
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T3: Dick Wilson, GPUSC, Site s
1 FROM: Lee Pictke, B L W SUBJ : Operation of IB RC Pump DATE: April 20,'1979 l
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This is in reference to concern over starting an RC pump opposite the operating 2A pumps.
The origin of the concern was an occurance at Rancho Seco in 1974 where under singic a noise was detected.
This operation was pumpogeration, at 532 F and the noise occurred while the pu=p was running.
It does not appear to be caused by pump start and secp. We have looked at single pump operations at DtI-2 which included various start and stop sequences.
In one test operation, pumps were operated slagly and t'.ie sequence of start and step was lA. 2A, 1B and 2B pumps. This sequence
}(h was without incident except for vent valve motien which la typical at low temperature, single pump cperation.
Attached is our su= mary of the effect of one pump operation en reactor intervals (W;04).
Alse attached is a co,py of our letter to Ranch Seco covering the noise incident of 1974 for your information.
Based on this enclosed information, we recommend that you remove the restriction on use of the 1-B RC pump.
If you have any f urther questions en this subject, plence Contact Ce.
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- a. 2. Sche,er ee e, ce.,ai co c,co, J. C. Simonis P.O. 0ci l200. Wnchburg Va. 24505 J. J. Stewart Te!ephor a: (804) 334 5111 October 8, 197h Sacrcmento !!unicipal Utility District 6201 S Street Sacramento, Califernia 95813 Attention: !!r. J. J. !!attimon
Subject:
Eincho Seco nuclear Generating Station - Unit No. 1 LPM Scund Indication B&W Reference - ::SS-11
Reference:
3&W letter, R.T. Schener to J.J. Matticoe, daf.ed 9/23/7h j
Dec.r Mr. Mattinoe:
On Septecter 13, 197h, an unidentified cound va: recorded en the Rancho Seco Loo:e Part !!cnitcr System during single pu p cperation of EC? "A".
B&W perforced a pre-
)
11minary evaluation cf the lpm tape recording. An a re: ult of the preliminary evaluatien, it van decided te perfore additicnal diagnectic tecting to improve the bacis fcr engineering judge =ent as documented in the referenced letter. Confirming cur October h, 197h conference telephone cenver:atien, the fc11oving presents a hrief deceription of the test meth de, re: ult: of the diaCncstic te: ting, and B&W's conclucicna and recommendatione:
- 1) Descrittio, of the tec+ methods The 3&U deployment concisted of three (3) highly trained engineer and approxi-mately $80,000 vorth of equipcent. ~hirteen (13) cc plete accelereneter channel:
vere installed and activated. The e locatior.: in conjunction with the eight (8) i A.I. Channels were deemed cufficient to perfer the analycia. Selected accele-rc=eter signals vers reccrded on a fourteen (ib) track tape deck.
.;o on-line analysis was attempted other than Opct eenit ring the aduio ch1ndel, playback cf the tcpe revealed the ncice: of interes c.nd the accociated pump configuration.
}
Filtering vas used to enhance the cignal te neize ratio of pairs of signals.
By use of a dual trace, delay time ts:e oscilice:cre, photographs of cignal A pairs "tur: ting" vere made and vere the tacis for delay time meneurements.
The spectrue analy:cr vac u:cd to obtain the spe"* - rf the unfiltered noise.
spectrue cf the noice and accceinted unfiltered voltage peak vere u:ed to esti-mate encrcy content. Delay tire: vere uced to triangulate the location of the noice.
l
l v
e dabcock & kVi!COX Mr. J. J. Matti=ce 2-October 8, 1974 LR4 Sound Indication l
- 2) Evaluatien of the data revealed the folleving a) There vere no unusual sounds observed during two, three, or four pu=p operation n't normal operating temperature (532F).
b) The subject cound of ecncern vas observed only during single pu=p cpera-tion, primary "A" or "C" RC pumps operating at 532F.
c) The subject sound of cencern was not observed during single punp cperation of "A" and "C" RC pumps at an isother=al condition of 30CF.
d) Tine delay data evaluation indicates the sound eninates frc: the icver portien of the vessel, specifically fran the elevation of the core suppcrt lugs + 6 ft.
e) Atte= pts to triangulate the anicuthal location of the sound by time delay data evaluation vere inconclusive (i.e., data indicated different radial locatiens for different data points),
f) The sound of concern does not exhibit the characterdstics of a "1cose part".
The delay times tre censistent with respect to elevation and there is no indicatiop of falli.kg to the bettc= of the vessel on pump coastdcun.
g) Data indicates that the energy level of the sound of concern is higher than the 1000 in.-lb calibration data point.
- 3) Cenelusior; a) It is the opinion of ELW that the sound does not represent a safety related proble:. This opinion is taced on the data which indicates the sound is not the result of a "lecse part" and that the phenemena causing the scund does not occur under ncrtal operating conditions (i.e., two, three, or fcur pumps operating at 532F).
b) Frc= analysis of the foregoing data evaluation, 3&W concludes that the =ost likely cause of the subject sound of cencern is =ovement of the cere support structure against a core support lug or lugs. The single pu=p operaticn configuration produces the =ost unbalanced cendition of lateral hydraulic forces en the core support structure, and therefore the highest probability 1
of contacting core support lugs. This eenclusien is further substantiated by the absence of the sound at lever te=peratures where the cicarances involved are expected by design to be greater.
It is further'the opinien of B&W that =cvement of the core support within its design envelope could prcduce this sound in the single pu=p mcde. It should be noted that the core support lugs arc designed to withstand laceral leads far in excess of those observed to accon=edate LOCA and seis=le loadings.
i 0
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.e, Ba*0 COCK & Wi!COX IL. J. J. !'.attimoe October 8, 1974 LF?! Sound Indication h)
P.eec= end:tions It is the opinien of B&W, based on evaluation of test data, that continuation a) cf the power escalation portion of plant startup does not represent an undue risk to the integrity of the equiptent involved.
B&W recc=nends that S!"JD continue sound nonitoring during power escalation b)
- esting as follovs
Assign a man (trained in LE4 use and familiar with noise tapes) to (1) listen continucusly to the LE4 during and i=nediately after all punp or major temperature changes.
Assign a man (trained as above) to listen to the LF?! frequently during (2) steady state operations and for sc=e designated peried of time after an alan:2.
3?JT recc= ends that neutron noise data te taken and evaluated during power c) escalation testing to further verify that abnormal cere support =cticn does not exist under normal plant operating conditions.
B&W recen= ends that plant operating precedures te revised to minimi::e single d) pu=p operation particularly in the case of "A" and "C" reactor coolant pumps.
If we =ay te of further service in this matter, please advi::e.
Very truly yours,
\\
B. T. Schc=er i
Senior ?roject l'anager
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7 J. T. Janis Project l'.anager JTJ:dc cc:
L. 3. 3:cvn E. L. Logan i
J. H. Jchnsten O
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