ML20128G841
| ML20128G841 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 02/08/1993 |
| From: | Chraznowski D COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9302160125 | |
| Download: ML20128G841 (31) | |
Text
Z ) 1400 opus Place Ccmmenwealth Edisen
+
Downers Grove, Illinois 60515 February 8,1993 Dr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Document Control Desk
Subject:
Byron Units 1 and 2, N 90 Docket Numbers 50 454 and 50 455
Reference:
NRC SER lssued January 31.1992 on Byron Station Inservice Testing (IST) Program for Valves Revision 10c and Bgon Inservice resting Program for Pumps Revision 9a.
Dear Dr. Murley:
Attached for your review and transmittalls Revision 9b of the IST Program for Pumps which includes a revision to Relief Request PR 7.
On January 31,1992 an NRC SER was issued on the Byron Station Inservice Testing Program for Valves Revision 10c and Byron Inservice Testing Program for Pumps Revision 9a. Contained in this SER were four open items. Three of these items were -
given conditional approval pending further action by Byron Station and one re ulred additionalinformation. These items comisted of Relief Request PR 1 involvl the use of ANSI /ASME OMb 1989, Part G (OM 6) vibration limits, Rollef Request R7 involving vibration limits on the Essential Service Water Make U 3 Pumps, VR 2 involving the check valves in the Sodium Hydroxide additive por;lon of the Containment Spray System, VR 18 involving full flow and backflow testing of several Emergency Core Cooling System check valves, and VR 19 involving the aackflow testing frequency and methodology for the Auxillary Feedwater Pump Discharge -
Byron Station wishes to address these issues as follows.
Condition:
Relief Request PR 1 was approved on the condition that "the licensee complies with all of the OM 6 vibration measurement requirements".
P::yme:
Byron Station is in full compliance with the vibration measurement requirements of OM 6 with the exception of the Essential Service Water Makeup Pumps OSX02PA & B which are addressed in Rollef Request PR 7.
Condition:
Relief Request PR-7 was approved on the condition tnat "the licensee obtains vendor's concurrence of the proposed ranges and complies with all other OM 6 vibration measurement requirements".
uest PR 7 has been revised to contain vendor recommended vibration limits and to inc1ude a letter containing vandor concurrence with the proposed vibration -
limits for the Essential Service Water Make Up pumps. Rellef Requect PR 7 is otherwise in full compliance with the vibration measurement requireme,1ts of OM 6.
12010n
(
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p-PDR
Dr, Murley F bruary 8,1993 Condition:
Rollef Request VR 2 was aparoved on the condition that "the licensee should actively investigate the use of non in rusive diagnostic techniques to demonstrate that these valves exercise open during flow testing".
Rosponse:
Rollef Request VR 2 has been revised by Braidwood Station to include non intrusive diagnostic techniques. Braidwood Station has submitted this revision for NRC review and approval. In an effort to conserve time by eliminating the need for two independent program reviews for Byron and Braidwood Stations, Byron Station requests an extension to allow the Byron revision of VR 2 to be submitted after NRC issuance of the Braldwood SER on this issue.
Request for AdditionalInformation:
Relief Request VR 18 was denied due to Insufficient detail.
Response
Relief request VR 18 has been reorganized to include the requested additional information and was resubmitted for NRC ovaluat!on and approval in March of 1992.
Byron Station is currently awaiting an NRC SER on this submittal.
Ccndition:
Rollef Request VR 19 was approved on the condition that "the licenses should investigate the use of non inLrusive diagnostic techniques to demonstrate that these valves will close upon cessation or reversal of flow".
Response
Re!lef Request VR 19 has been revised by Braldwood Station to include non intrusive diagnostic techniques. Braidwood Station has submitted this revision for NRC review and approval. In an effort to conserve time by eliminating the need for two independent program reviews for B ron and Braidwood Stations, Byron Station rer uests an extension to allow the ron revision of VR 19 to be submitted after b RC issuance of the Braldwood SER on is issue.
Please refer any questions or comments to this office.
Sincerely, D.
p David ). Chrzanowski Nuclear Licensing Administrator
Attachment:
Relief Request, PR 7, Rev. 9b cc:
A. B. Davis, Regional Adrninistrator - Rlli J. Hickman, Pro,ect Manager NRR/PDill 2 H. Peterson, Senior Resident inspector (Byron) i ZNLD/2500/2
Rev. 9b d
4 RELIET REQUEST NO. PR-7 1.
PittiP_H!,!)iD EE :
OSX02PA, D pumps 2.
LE'MBrrt or ITrMS:
2 pumps.
3.
ASBI CODE CLASS:
2&3 4.
ASME_CQRE. S!;CTLCILXLEEWlEf tdElII5:
ANSI /ASME OMb-1989, Part f. states:
"If deviations fall within the alert range of Table 3, the frequency of testino specifled in paragraph 5.1 shall be doubled until the cause of the deviation is determined and the condition corrected.
If deviations fall within the required action range of Table 1, the pump shall b'* declared inoperable until the cause of the deviation has been detarmined and the condition corrected.
t When a t.ast shows deviations outside the acceptable range of Table 3, the instruments involved may be recalibrated and the test rerun."
TABLE 3 Pump Pump fest Acceptable Alert Required Itre 5 peed Parameter tante tante Action Range Cent'NHL and
< 600 rpm r, or t s 2.5 V,
> 2.5 V, to 6 V, or
> 6 V, or senu at hne
> 10 5 mils
>12 mils g
mn esose an Centneusal ano a 600 rpm V or 6, s 2.5 V.
> 2.5 V, to 6 v. or
> 6 V, or g
i ertic al hne
> 0.315 in.nec
> 010 in.tsec
$natt INote cd Ecoc4dont
- t. or $
s 2.5 v.
> 2.5 V, to 6 v.
> 6 V, 5.
EASIS_EQR_ELlIE :
The Essential Service Water Pumps OSX02PA & B are of a very unique design (see fig. 1).
The pump is attached to a horizontal diesel driver via a right angle gear drive, and the gear drive is located approximately 39 feet above the pump. This configutation assures pump operability during the design basis floodino of the Rock River.
As would be expected, this extreme configuration results in vibration characteristics which are different from pumps of a more conventional design. The vibration levels for these pumps are consistently higher than the commonly expected values.
These pumps exhibited higher thar usual vibration levels at the time of their installation (approximately 0.4 - 0.45 in/see far the gear box and approximately 0.20 - 0.25 in/see for the-pump). at which time they were verified by the vendor to be operating properly. and have continued to display high vibration levels throughotit their service lif e.
?
(0091D/0034D/063002) 3.5 - page 15 of 17 l
Rev. 9b RELIET REQUEST HO. PR-7 6.
AMLEUACEST.IllG Also characteristic of these pumps is the fact that the gent box vibration levels are consistently higher than 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 f or 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 vibration levels are characteristic of this unique design and do not indicate pump degradat lon.
However, we propose that tighter acceptance criteria be used for the pump than for the gear box in order to detect any degradation that may occur in the future.
Based on performance data, Byron Stntion proposes that the following ranges be utilised to monitor "Abration levels for OSX02PA & B (where V = the vibration amplituda (in inches per second] and Vr a the reference vibration amplituda (in inches per second) established when the pump was known to be op-rating acceptably):
OSX02PA & B Acceptance Alert Required Action Location Range Range Range fin /ste)
(in/sec)
(in/sgs)
(in/sec)
O Pump Shaft V 2.5Vr 2.5Vr<V16.0Vr V>6.0Vr 1
and or or V 0.325 0.325<V10.700 V>0.700 1
Gearbox V 2.5Vr 2.5"t<V16.0 Vr V)6.0Vr 1
and or or.
l V 0.560 0.560<V10.900 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 JUSTIFICATION:
A review of past performance parameters for the SX Make-up pumps hrs been completed.
Attached are graphs of flowrste 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 tables (see table 1 and 2) it can be seen that the vibration fluctuatas dramatically but showed no overall upward trend over a 2.5 year period.
(0091D/0034D/063002) 3.5 - page-16 of 17
Rev. 9b
)
PELIET REQUEST NO. FR-7 7.
JUSTI r1CATIQll: ( cont )
Also, Commonwealth Edison System Material Analysis Department (SMAD) measured vibration levels at the points shown in figure 2 and compared the results to available data on vibration amplitudes for similar near drive arrangements throughout the company. These were diesel driven fire pump units at Braidwood, Zion, and Dresden stations.
Regardless of vendor, these four units all exhibited high vibration amplitudes on the gear drive consistent with the elevated vibration levels recorded on the SX Make-up pumps at Byron Station (see floure 3).
The OM-6 limit on the alert range for vibration is either 2.5 times the refe'ence value or 0.325 (whichever is less) and the code limit on the required action range is 6.0 times the reference value or 0.700 (whichever is less).
Based on vendor evaluation (see Attachment C) an alert value of 0.560 was selected and based on engineesing judgement, a :equired action value of 0.900 was selected.
These are conservative limits in comparison to the OM-6 limits.
OH-6 limits allow an increase of 140% between the alert limit and the required action limit (for 2.5 times reference to 6.0 times reference) or an increase of 115% (for the 0.315 to 0.700).
(N The alent. limit being proposed here is 0.560 and the required action
(,)
limit is 0.900.
These proposed limits allow only 61% increase from alert to required action.
This is a much more conservative increase than the OH-6 requirement.
By using accepta^ce ranges which are reflective of the intrinsic characteristics of the pump, performance can be monitored more effectively and unnecessary and excessive testing of properly functioning equipment can be avoided.
8.
AEfLICARLE TIME PERIODI This relief is requested quarterly, during each inservice pump test, during the first inspection interval.
9.
APPROVAL SIhTUS:
a.
November '90: SX Make-up Pump vibration limit relief request movad from RELIEF REQUEST NO. PR-1 to RELIEF REQUEST NO. PR-7 for clarification.
b.
March '91 Additional information plus separate Pump Shaft and Gearbox limits proposed based on NRC request for additional inintmation, c.
August '91: Additional information on operating history and elevated vibration levels on similar pumps added based on NRC request for additional information.
Relief pending per Approve' from the NRC is required PRIOR to use of this relief request.
T
[O Expedited review and approval is requested.
d.
January '93:
Vendor recommendation incorporated.
l (0091D/0034D/063092) 3.5 - page 17 of 17
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08bi P*98 2 of 10 yo? ggyo? M og OSX02PA PUMP 11NE SHAFT VIDRATION(RAD N-5) (IN/SEC)
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875 -
B50 -
l 825 -
l 800-f
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- -- -----------------------~~** - ~~~-~~~~~~
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750-125-7oc c75 2
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ATTAcuvinry A page 4 of 10
.90? gy0N OSX02PA UPPER GEAR DOX VU3RA110N(VERT) (IN/SEC)
VUGBV 9004....................................................................................
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12/05/57 04/16/89 08/31/90 01/13/92 TESTDATE
01/U!
ATTACHMENT A pdge 7 Of 10
$0? DgoW OSX02PA LOWER GEAR BOX VIBRATION (VERT) (IN/SEC)
VLGBV
,9006--~~-----------------------------~~------------------------------------------------
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775) 750 -
- 725, 700-l i
6754i 650 -
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__._m_______.________._._____._m__.____.___________.____.____
ATTACIDENT C STEWART & STEVENSON SERVICES, INC, s
P O 60A it)?. woss OH TOAS 77251 ta?. rtth 023.t'41 t.02NISTRATICN B.CO FAX (713i O2349t6. FU*CMA$aG CE8T Fu '713; 9211196 TELLt 96439'. Tvtx Sto-253m 1-21-93 TRANSMISSION DATE RECIPROCATING ENGINE DIVISION We are transmitting i
pages (including cover letter).
If transmission is incer.plete, please call (713) 923-0317.
Pleans deliver to:
Page
_1._, o f _ 1,_
NAME warren Wacner FROM Jin Bell FIRM Comonwealth Edinen PHONE N0 f *? 13 ) 923-0337 FAX NO (B15) 234-5441 X2270 FAX NO
'713) 923-4917
REFERENCE:
8V71N Pump Unit O
W.O.
N74410
Dear Mr. Wagner,
As per our telephone conversation Stewart in Stevenson's mininun standard for vibration peak to peak is 6 mils displacement at 1800 RPM hori::ontal and vertical.
This corresponds to.56 inches per second velocity peak.
The existing.55 inches per second velocity peak corresponds to 5.8 mils displacement peak to peak which is vs. thin tolerance.
If you have any further questions, please get back with me.
Very truly yours, o
es 'e 1 cc:
Robert Mitcham N.
J3021.03 - 12340307M ENG'NEEFJ:iD POWE A F04 TMF WA%E. AVIAT'ON POWER G?.NERATCN. CE9NSE ANC PETo.Ottt,MA INDUSTFi!ES
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