ML20211H165
| ML20211H165 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 02/21/1987 |
| From: | Agosti F DETROIT EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TAC-63529, VP-NO-87-0033, VP-NO-87-33, NUDOCS 8702260097 | |
| Download: ML20211H165 (6) | |
Text
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Nuclear Operatums b
Detroit um Edison BIAEF" W ra.
VP-f0-87-0033 February 21, 1987 U. S. Nuclear Regulatory Canission Attn: Doctment Control Desk Washington, D. C.
20555
References:
Fermi 2 NIC Docket No. 50-341 NIC License No. NPF-43
Subject:
Relief Request to Inservice Testina Procram for Ptmos ard Valves Ralief Requests PR-9-R1 and PR-10-R1 to the Fermi 2 Inservice Testing Program (IST) for Ptmps and Valves are attached in accordance with 10CFR50.55a(g) (5) (iii). 'Ihe enclosed relief request provides an alternative vibration acceptance criterion for the High Pressure Coolant Injection (HPCI)
PWP.
The HPCI vibration relief request has been discussed verbally with the Senior Resident Inspector and the NRR Project Manager.
If you have any questions in this concerning this relief request, please contact Mr. Frank Sondgeroth at (313) l 586-4270.
i Sincerely, 0
n'h '
g g
Enclosum l
cc:
J. J. Stefano W. G. Rogers E.
Greenman l
USNIC Document Control Desk l
Washington, D. C. 20555 l
I NN""kMU ggg,kI Ph l
RELIEF REQUEST PR-9-R1 PUMP:
HPCI Booster Pump PUMP NO:
E4101C001B CLASS:
2 FUNCTION:
Provide High Pressure Coolant Injection SECTION XI REQUIREMENT:
Vibration amplitude displacement shall be measured quarterly during inservice testing ( Table IWP-3100-1 and IWP-3400 (a) ).
BASIS FOR RELIEF:
During preoperational testing of the HPCI system, vibration of the HPCI Booster Pump was measured and determined to fall within the Required Action Range of Relief Request PR-1.
Additional vibration analysis of the HPCI Booster Pump was subsequently performed.
Results of these analyses have been documented in Detroit Edison Engineering Research Reports 85D15-10, Rev. 1 and 86D14-3.
Based upon review of both vibration data and vibration analysis reports, Detroit Edison, General Electric, and Byron Jackson ( the pump manufacturer ),
concluded that there are no major vibrational concerns that would prevent the HPCI pump from performing its intended safety function through planned TC-3 testing.
As long as the measured vibration is less than 1 in./sec. and the frequency content of the dominant vibration peak is in the vane passing range, the pump should support at least one design basis accident event.
The primary source of vibration of the HPCI Booster Pump is attributable to the pump's vane passing frequency.
Although the existing vibrations are higher than the vibration criteria stated in Relief Request PR-1, they are acceptable and reflect the unique operating characteristics of the HPCI Booster Pump.
Therefore, to allow practical vibration monitoring of the HPCI Booster Pump, alternate vibration criteria are required in lieu of the criteria stated in Relief Request PR-1 on an interim basis until the end of Test Condition 3 (TC-3).
ALTERNATIVE TESTING:
During quarterly testing of the HPCI system, the following vibration criteria will be used for the HPCI Booster Pump.
These criteria are in agreement with the pump manufacturer (Byron Jackson) and General Electric Co.
RELIEF REQUEST PR-9-R1 (CONT'D)
Acceptable Range Alert Range Required Action Range 0 to 2Vr 2Vr to 4Vr
> 4Vr Where Vr = the reference vibration velocity measured in a horizontal or vertical plane perpendicular to the pump's rotating shaft; whichever is greater.
Vr is measured in inches / second.
Overriding the above multipliers (i.e. 2Vr and 4Vr) is an additional criterion that no vibration velocity exceed a value of 1.0 in./sec.
By using the above cirteria, meaningful vibration monitoring of the HPCI Booster Pump will be obtained for an interim period until the end of TC-3.
Because the above vibration frequency amplitude manifests itself in the form of loose parts (i.e. bolts, fittings, etc.), additional visual inspections of the subject equipment i
will be conducted at the conclusion of each run of the machine.
Such inspection combined with the vibration monitoring will be sufficient to detect any degradation of the equipment prior to failure.
i t
RELIEF REQUEST PR-10-R1 PUMP:
HPCI Main-Pump PUMP NO:
E4101C001A CLASS:
2
?
FUNCTION:. Provide High Pressure Coolant Injection j
SECTION XI REQUIREMENT:
Vibration amplitude displacement shall be measured quarterly during inservice testing ( Table IWP-3100-1 and IWP-3400 (a) ).
BASIS FOR RELIEF:
During preoperational testing of the HPCI system, vibration of the HPCI Main Pump was measured and determined to fall a
within the Required Action Range of Relief Request PR-1.
Additional vibration analysis of the HPCI Main Pump was subsequently performed.
Results of these analyses have been documented in Detroit Edison Engineering Research Reports 85D15-10, Rev. 1, and 86D14-3.
From these reports it is concluded that the overall vibration of the HPCI Main Pump is being influenced by vibrations from the HPCI Booster Pump.
The most significant 4
frequency component measured at the Main Pump is at the vane passing frequency of the Booster Pump.
Vibration from the l
Booster Pump is being transmitted to the Main Pump via interconnecting piping.
Because vibration from the Booster Pump is being transmitted to the Main Pump, overall vibration measurement of the Main Pump does not adequately reflect the operating condition of l
the Main Pump.
Therefore, to allow practical vibration monitoring of the HPCI Main Pump, alternate vibration testing is required.-
ALTERNATIVE TESTING:
During quarterly testing of the HPCI system, both overall vibration and filtered vibration at the Booster Pump vane passing frequency will be measured.
l Vibration of the Main Pump will be corrected to segregate i
the frequency component induced by the Booster Pump.
The following equation will be used for this vibration correction:
l l
~
.n_.-~.-___-_,._..-.
RELIEF REQUEST PR-10-R1 (CONT'D) 2 2
Vc =
Vo
- Vf where:
Vc = The corrected vibration of the HPCI Main Pump
( in./sec. ).
Vo = The overall vibration measured at the HPCI Main Pump ( in./sec. ).
Vf = The filtered vibration at the HPCI Main Pump measured at the vane passing frequency of the HPCI Booster Pump ( in./sec. ).
Corrected vibration, Vc, will be used to monitor the HPCI Main Pump degradation in lieu of using overall vibration, Vo.
Corrected vibration, Vc, will be compared to the following criteria for determining data acceptability and corrective actions.
Acceptable Range Alert Range Required Action Range 0 to 2Vcr 2Ver to 4Ver
> 4Ver Where ver = The reference corrected vibration velocity measured in a horizontal or vertical plane perpendicular to the pump's rotating shaft, whichever is greater.
Ver is measured in inches / second.
Overriding the above, criteria (
i.e.
2Vcr and 4Vcr ) is an additional criterion that no vibration velocity exceed 1.0 inches / second.
By using corrected vibration, Vc, in lieu of overall vibration, Vo, degradation of HPCI Main Pump performance will be more accurately detected.
Detroit Edison, General Electric, and Byron Jackson ( the pump manufacturer ),
conclude that there are no major i
vibrational concerns that would prevent the HPCI pump from performing its intended safety function through planned TC-3 testing.
As long as the measured vibration is less than 1 in./sec. and the frequency content of the dominant vibration peak is in the vane passing range, the pump should support at least one design basis accident event.
Because the above vibration frequency amplitude manifests itself in the form of loose parts (i.e. bolts, fittings, etc.), additional visual inspections of the subject equipment will be conducted at the conclusion of each run of the
RELIEF REQUEST PR-10-R1 (CONT'D) machine.
Such inspection combined with the vibration monitoring will be sufficient.to detect and degradation of the equipment prior to failure.
?
I
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