ML17208A462
| ML17208A462 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 03/21/1980 |
| From: | FLORIDA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML17208A461 | List: |
| References | |
| NUDOCS 8004210184 | |
| Download: ML17208A462 (4) | |
Text
INTERIM DEFICIENCY REPORT DAMPER ACTUATORS Name of Station:
Owner:
Architect/Engineer:
Date NRC Notified:
Interim Report Filed:
St. Lucie Plant - Unit 2 Florida Power E Light Company Ebasco Services, Incorporated February 21, '1980 Harch 21, 1980
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I.
SUYi/NRY American Harming-8 Ventilating, Inc.
had notified the Architect/
Engireer that a certain spring in some hydramotor actuators for dampers were manufactured from an incorrect material.
American Hari~ing had also notified the NRC 0 fice of Inspection and En orcement per 10 CFR 21.
In addition to the above reported deviation, American Harming 5
Ventilating also notified the Architect/Engineer that selection nomographs for selecting or sizing certain hydramotor actuators could be interpreted incorrectly.
Again, American Harming notified the NRC Inspection and Enforcement Office per 10 CFR
=
21.
Per the requirements of 10 CFR 50.55(e),
the events are deemed potentially reportable and by telephone FPL notified the NRC on February 21, 1980 of such.
This interim report is being sub-mitted to advise the NRC of the status of these deficiencies.
II.
DESCRIPTION ITT General Controls of Glendale, California, a subcontractor to supply actuators to American Harming 8 Ventilating Inc.,
notified American Harming of the existence of a material deviation in a certain spring in some hydramotor actuators.
One spring, ITT Part No.
- 17443A, used in some NH91, 92, 95, 96 and 98 milliampere hydramotor actuators has been discovered to be manufactured from an incorrect material.
It does not possess the designed strength and will, upon actuation of a greater than three inch stroke, take a permanent set.
This results in a decreased force output of approximately 160 lbs.
at all compressed positions.
Hhen these aforementioned actuators are subjected to an electrical input control signal of zero, the actuator output does not develop the published force when the output shaft is moved to its full position (i.e., fully closed or fully opened).
The dampers (D) impacted by the above spring material deviation are as follows:
Shi ed to Site Not Shi ed D-14 D-16 D-29 D-30 D-31 D-32 D-8A D-88 D-9A D-98 D-15 D-33 D-34 D-35 D-36 All the above dampers are safety related.
II.
DESCRIPTION (Cont')
0.. rebruary 5, 1980, American Warming received a let er from ITT General Controls stating that American Warming purchased ITT General Controls'H90 series or NH90 series hydramotor actuators which may,have been selected or sized by using the "Selection Nomograpns" on ITT's application form $608.1067.2.
ITT General Controls advised American Warming that the subject nomographs could be interpreted incorrectly.
The forces that are derived from the chart represent the actual spring or hydraulic forces only, i.e., the effects of friction or residual hydraulic forces are not incl'uded.
These actuators could have about 100 lbs. of friction and an additional 40 lbs. of residual hydraulic pressure.
This means that there was a possibility that the ITT General Controls'H90 series actuators supplied with American Warming dampers would not meet the specified safety factors with respect to thrust delivered to the damper assembly.
The dampers (D) and 1'ouvers (L) impacted by the above nomograph problem are as follows:
Shi ed to Site Not Shi ed D-7A D-7B D-12A D-128 D-13 D-3.4 D-16 D-21 D-17A D-22 D-17B D-23 D-18 D-24 D-19 D-27 D-20 D-28 D-29 D-30 D-31 D-32 D-39 D-40 2L-8 2L-11 D-1 D-6A D-2 D-6B D-3 D-8A D-4 D-BB D-5A D-9A D-5B D-9B D-11A D-11B D-15 D-33 D-34 D 35 D-36 All of the above dampers and louvers are safety related.
III.
CORRECT I'IE ACTION ITT G neral Controls has advised American Warming that the spring force output data is incomplete and that further tests are being conducted.
In addition, ITT General Controls has committed to supplying American Warming accurate data on the thrust delivered by actuators affected by use of the nomograph.
American Warming will then be in a position to identify those damper/actuator assemblies which may be out of specification and to develop corrective procedures where necessary.
To date there has not been an established completion schedule for either ITT General Controls'ctuator problem.
III.
CORRECTI YE ACTION (Cont')
American llarming will notify Ebasco Services of any resolutions reached.
Until such time, the affected dampers already at the site are being placed on hold and no other affected dampers in the vendor's shop will be shipped.
IV.
SAFETY IMPLICATIONS Until American i<arming 8 Yentilating, Inc. determines the extent to which the spring material deviation or actuators selected or sized using nomograph on ITT General Controls application form 8608. 1067.2 deviated from specification requirements, these deficiencies are deemed potentially reportable.
If either of the deficiencies result in improper performance of the safety related
- dampers, and were it to have remained uncorrected, it could have affected adversely the safety of operations of the nuclear plant some time throughout the expected lifetime of the plant.
V.
CONCLUSIONS A final report is anticipated by June 30, 1980.
The final report will provide
.he results of the American )!arming 5 Yentilating, Inc. review and the necessary corrective actions to be taken.