ML20132C512

Forwards Power Sys Branch Review of Appeal Issues,Including Alarm for Rocker on Lube Oil Reservoir,Class 1E Power for Lighting & Communication Sys & Air Dryers for Emergency Diesel Generator.Issues 1 & 4 Resolved

ML20132C512
Person / Time
Site:	Beaver Valley
Issue date:	10/17/1984
From:	Rubenstein L Office of Nuclear Reactor Regulation
To:	Novak T Office of Nuclear Reactor Regulation
Shared Package
ML19283C868	List: IA-85-926, Forwards Rept of 840726-27 in-progress Audit Re Detailed Control Room Design Review (Dcrdr).Dcrdr Proceeding Satisfactorily.Concern Expressed Re Differences Between Unit 1 & 2 Control Rooms & Role of Human Factors Specialist ML20132B767 ML20132B791 ML20132C010 ML20132C076 ML20132C105 ML20132C131 ML20132C209 ML20132C245 ML20132C247 ML20132C253 ML20132C285 ML20132C290 ML20132C295 ML20132C301 ML20132C310 ML20132C323 ML20132C334 ML20132C338 ML20132C344 ML20132C365 ML20132C379 ML20132C383 ML20132C389 ML20132C394 ML20132C421 ML20132C427 ML20132C433 ML20132C442 ML20132C453 ML20132C459 ML20132C464 ML20132C468 ML20132C474 ML20132C479 ML20132C484 ML20132C487 ML20132C493 ML20132C499 ML20132C512 ML20132C518 ML20132C536 ML20132C542 ML20132C559 ML20132C569 ML20132C575 ML20132C633 ML20133M691 ML20133P834
References
FOIA-84-926 NUDOCS 8411210389
Download: ML20132C512 (5)

Text

_ _ _ _ _ _ -

,pa cao

• ~# '

UNITED STATES

, j; g NUCLEAR REGULATORY COMMISSION

wasHWGTON, D. C. 20655

\ ..../ .

October 17, 1984 MEMORANDUM FOR: Thomas M. Novak, Assistant Director l for Licensing, DL FROM: L. S. Rubenstein, Assistant Director for Core and Plant Systems, DSI

SUBJECT:

BEAVER VALLEY UNIT 2 APPEAL ISSUES -

POWER SYSTEMS BRANCH

REFERENCE:

Memo, T. Novak to L. Rubenstein et al, " Beaver Valley '

Unit 2 Appeal Issues," dated October 11, 1984 In accordance with the referenced memorandum, the Power Systems Branch has reviewed the following appeal issues that come under their review responsibility:

1. Alarm for rocker ann on lube oil reservoir  !

(430.119)

2. Class 1E power for lighting and communication system (430.66and430.68)

3. Air dryers for emergency diesel generator (430.97and430.100)

4. Motor-operated accumulator isolation valve (open item #67)

The enclosure provides the requested information on the above issues. '

Please note that issues 1 and 4 have been resolved and will be so reported in a subsequent supplement to the SER.

wN L. S. Ru enstein, Assistant Director for Core and Plant Systems Division of Systems Integration cc: See Page 2 i l

Contact A. Ungaro x29416

?

{U /

Thomas M. Novak I f

1 cc: R. Bernero 1 D. Eisenhut G. Knighton M. Ley M. Srinivasan J. Knight R. Giardina J. Knox A. Ungaro i

1 l

i w .

l i

ENCLOSURE BEAVER VALLEY UNIT APPEAL ISSUES  !

POWER SYSTEMS BRANCH I 1

i 1.

i Alarm for Rocker Ann Lube Oil Reservoir (430.119)

The staff's original concern was about the loss of lubrication to the >

rocker arm assembly in the event of loss of lube oil level in the '

reservoir of the rocker arm lube oil system during diesel engine operation or standby condition. i In telephone discussion of October 16, 1984 between A. Ungaro (PSB),

Gary Beatty (Dusquesne Light) and Marilyn Ley (LPM) regarding the above concern it was established that adequate protection measures are included in the diesel generator control system to preclude the above from occurring during engine operation. With regard to the similar concern during engine standby, the staff was advised that the reservoir ,

tank is equipped with a sight gage glass which can be observed to verify oil level. The applicant has comitted to update the response to question 430.119 to reflect a more indepth description of the lube q oil system controls that will address the staff concerns. With I confirmation of the above additional infomation, the need for the low level alann is eliminated and the staff considers this issue resolved.

The above will be reflected in a subsequent supplement to the SER. 0

2. Class IE Power for Lighting and Comunication System (430.97 & 100 Standard Review Plan (SRP) 9.5.2 "Comunication Systems" states in part r that the " capability of the system to provide effective intra-plant ,

comunications and effective plant-to-offsite comunications during  !

normal plant operations and during transients, fire, and accident conditions, including loss of offsite power." The SRP further states "the comunication system is acceptable if the integrated design of the system will provide effective communication between plant personnel in all vital areas during normal plant operation and during the full spectrum of accident or incident conditions (including fire) under maximum potential noise level." .

l 4

SRP 9.5.3 " Lighting Systems" states in part the lighting systems are  !

reviewed with the following considerations: "(1) the capability of the j nomal lighting system (s) to provide adequate lighting during all plant 1

operating conditions, and (2) the capability of the emergency lighting system to provide adequate lighting during all plant operating ]

conditions, including fire, transients and accident conditions, and the effect of loss-of-offsite power on the emergency lighting system." ,

m _

.

• l 2

All lighting and comunication systems in the applicant's present design are powered from non-Class IE sources. The applicant has not provided adequate assurance on how he can safely shut down the plant under seismic conditions.

The staff requires that under a design basis seismic event, the applicant's design should provide adequate connunications between the control room and necessary plant safety related areas and adequate lighting in these areas to enable operator to perform the necessary safety functions.

3. Air Dryers for Emergency Diesel Generator (430.97 & 100)

The applicant's air starting system provided for the diesel generators relies on periodic blowdown of the air receivers for the removal of

. entrained oil and excess water from the starting air. The applicant states that this action will preclude any air start system contamination and hence the need for air dryers.

The staff does not agree with the above rationale for the following reasons:

(1) Manual blowdown of air receivers will only eliminate accumulated condensed moisture. The air in the air receivers (and system

- piping) will still be saturated at the operating pressure and temperature. A reduction in pressure, temperature or both will cause condensation.

(2) Blowdown of system piping will only eliminate possible condensed moisture and some removal of corrosion products. The system is still exposed to moist air.

(3) Continuous system exposure to moist air will eventually result in internal corrosion and corrosion products buildup causing clogging of filters and/or malfunction of air start control valves with resultant unavailability of the diesel generator.

Over a period of time the air start system as designed for Millstone 3 cannot preclude corrosion and buildup of corrosion products within the system, thus subjecting the air start system to potential contamination and failure to perfonn its safety function. O staff study NUREG/CR-0660 (SRP Section 9.5.6) hasperating identifiedexperience moisture and in air start systems as the single greatest cause of diesel generator unreliability. This problem can occur in diesel engines with air start motors as well as air-over-piston started engines.

In addition, staff discussion with the various diesel generator manufacturers relative to air start systems for their diesel generators have resulted in the following uniform recomendations:

b.

n.. . -

j l

l l'

3 I

1. use of dry and clean " instrument quality" air, or

2. If the engine is to be provided with its own starting air system they strongly recommend the use of air dryers.

For reasons cited above, the staff requires the installation of air dryers in the standby diesel generator air start systems at Millstone 3, as has been done in similar designs recently approved by the staff.

4. Motor Operated Accumulator Isolation Valve (0 pen Item #67)

The staff's concern is how power will be removed from the above valve motor to meet the single failure criterion and what procedures will be in place to verify that power is removed. '

The applicant has provided the necessary design details and other information to resolve the staff concern. The resolution of this issue will be reported in a subsequent supplement to the SER.

i i

h i

i i

l l

a