ML20083D349
| ML20083D349 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 09/23/1991 |
| From: | Schuster T COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9109300212 | |
| Download: ML20083D349 (2) | |
Text
... ~ -
i Ccmmonw:alth Edison
)
1400 Opus Place O
O Downers Orove, niinoin 00515 September 23,1991 i
Dr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission
)
Washington, D.C. 20555 Attn: Document Control Desk
Subject:
Byron Station Units 1 and 2 Inservice Testing Program for Pumps Revision 9a NRC Docket Nos,50-A54 and 50:455
References:
(a) September 13,1991 letter from T. Schuster to Dr. T. Murley submitting a revised in Service Testing (IST) Program for Pumps and Valves, Revision 9a and 10c respectively.
Dear Dr. Murley:
Attached is a revised page to the IST Program Plan for Pump Rollef Request PR 7 which is being submitted for NRC Staff review, This relief roc uest was originally submitted for NRC Staff review in Reference (a) and has aeen subsequently revised to correct an error in the wording of the first paragraph of section 7 Justification. Substitute this revised page in the previously transmitted Pump Relief Request PR 7, Revision 9a. Please direct any questions you may have regarding this request to this office.
Respectfully,
%$/
$t~
Terence K. Schuster Nuc'sar Licensing Administrator i
Attachment cc:
A. Hsia, Project Manager - NRR W. Kropp, Senior Resident ins Sector - Byron A. Bert Davis, Regional Admin strator - Rlli 9109300:12 e;n973
{DR ADoCK 0500o454 fil,l \\
\\"
}
ZNLD/1165/19 1.
,.-. - _ _., -.~
a*
dev. 9a a
e DRATT RELIET REQUEST NO. PR-7 6.
ALTEP.NATE_IISIIRG Also characteristic of these pumpe ic the fact that the gear box vibrution levels are consistently highor tnan the pump vibration levels.
We propose that, in order to properly monitor this uniquely designed pump, separate acceptance ranges be used for the gear box and the pump.
The vibration levels for the pump, though consistently higher than those for conventional pumps, display no significant upward trend over a period of approximately six years.
This is significant evidence that these vibratior. levels are characteristic of this unique design and do not indicate pump degradation.
ilowever, we propose that tighter acceptanco criteria be used f or the pump than f or the gear box in cr er to detect any a
degradation that may occur in the future.
Based on performance data, Byron Station proposes that the following ranges be utilized to monitor vibration levels for OSX02PA & B (where V the vibration
=
amplitude (in inches per seconct) and Vr u the reference vibration ampli tude (la inches per secend] established when the pump was known to be operating acceptably):
2SXO2PA & B Acceptance Alert Required Action Location Range Range Range f
.in/sec)
'in/ sect tin /sec3
'In/mac)
?smp Shaft 712.5Vr
- 2. 5Vr c V16. 0V r 7>6.0Vr and or or
/to.3;5 0.325cv o.;;0 7>0.700 s
- earcon vt2.5Vr 2.5Vr cV 6. 0Vr 7 6.0Vr 1
and or or V 0.600 0.600cV10.900 V>0.900 1
~
Additionally, although it is obvious that this pump has unusual characteristics and understandably high vibration levels, we plan to maintain conservatism in our maintenance practices and replace the gear assembly when parts are available to re-verify that the high vibration levels are characteristic of this pump design.
7.
JUSTIFICATID!{ s A review of past perf ormance parametern f or the SX Make-up pumps hns been completed.
Attached are graphs of flowrate and vibration data over the last 2.5 years of operation.
Prior to 1989, only the maximum peak vibration values were recorded without indication of orientation.
Since 1989, all the individual peak vibration values at each location were recorded with associated orientation, therefore, the prior data cannot be directly compared to recent data, from the attached plots (see attachments A and B) and t able s (see table 1 and 2) it can be seen that the vibration fluctuates dramatically but showed no overall upward trend over a 2.5 year period.
(0091D/0034D/090591) 3.5 - page 16 of 17
. _ _