ML20076N146
| ML20076N146 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 03/15/1991 |
| From: | Stokes K GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML20076N108 | List: |
| References | |
| CON-#191-11564 90-617-03-OLA, 90-617-3-OLA, OLA, NUDOCS 9103280124 | |
| Download: ML20076N146 (5) | |
Text
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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION ATOMIC SAFETY AND LICENSING BOARD In the Matter of a
Georgia Power Company, I
g,t al.,
I
-(Vogtle Electric I
DOCKET NO. 50~424-OLA Generating Plant, a
50-425-OLA Units 1 and 2) 1 ASLBP NO. 90-617-03-OLA AFFIDAVIT OF KENNETH C.
STOKES IN SUPPORT OF APPLICANT 8' RESPONSE TO THE BOARD'S MEMORANDUM AND ORDER OF JANUARY 22, 1991 I, Kenneth C.
Stokes, having first been duly sworn, hereby depose and state as follows:
1.
I am currently employed by the Georgia Power Company as a Senior Plant Engineer-at the Vogtle Electric Generating Plant-("VEGP"), located near Augusta, Georgia.
In my position I serve as a dedicated engineer responsible for the diesel generator systems and the fuel oil systems for the diesel generators.
I have held the Senior Plant Engineer position since 1985.
2.
I graduated from the University of South Carolina in 1981 with a' Bachelor of Science degree in Electrical Engineering.
In the summer of 1981 I was employed by Georgia 9103280124 910320 PDR ADOCK 05000424 O
~.
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i Power Company as a_ Plant Engineer at the VEGP.
Initially, I-wasjassigned various taskarassociated with the eventual start-uplofLUnit 1,. including development of_ construction acceptance tests:(" CATS") and maintenance spare parts:
inventory lists.
Then,-in_the' fall-of 1983, I was assigned M
to provide engineering assistance for the start-up-of the-Unit-l' diesel generators,_includingItheir? fuel systems.
O'
! specific efforts involvad-the day-to-day' supervision of the-Loverhaultandrinspection of the' diesel: generators'as-part'of a
' design ~' review / quality _ revalidation program for the diesel 1 generators., My current responsibilitiesfinclude-providing assistance _ toi the. Maintenance Department ;when: maintenance-work involves theidiesel= generators and expertise to thei l Operations: Department concerning_the design _and capabilities
,o of the diesel generators..
73.
-This1 Licensing Board,:in its January 22, 1991
' Memorandum:and Order, asked;the question, "How-is the-capability 1for testing the statustand' operability-ofLthe-bypass / circuits maintained, an required by Reg. Guide 1.9,;
_ position:77"' Regulatory Guide J.9,' position ? (Revk2),,
s
~
4 states, "The design of!the'bypasu circuitry.
.-should
? include the (capabilityf for (1) testing: the status Land
- operabilityfof.the bypass circuits, [and).(2)_ alarming inLthe
. control room abnormal'valuesLof all bypass parameters."
c 2
The short answer to this question is that the valves added to the pneumatic lines provide visual indication of the trip bypass status:
if the valves are closed the trip is bypassed and,-if open, the trip is operable.
An understanding of this brief answer, however, requires further explaantion.
First, all bypass circuits are tested-1 4
locally and not from the control room.- That is, the six non-
-essential trip features (high pressure crank case, low pressure turbo oil, high temperature engine bearing, low pressure jacket water, high vibration and high temperature lube oil), are verified by an operator at the diesel generator control panel.
Local verification of the valves is consistent with the local testing at the diesel generators.
Second, theT" testing" required by the Reg. Guide-verifies the bvoasa, not the functioning of the sensors.
In other words, the testing does not verify that the actuation signal is
. sensed; th'e testing creates a false signal after'the sensor andsverifies-only that the bypass-occurs.
Third, the Reg.
' Guide does not expressly require " automatic" testingEofsthe bypasstcircuits.
Fourth, the frequency of the testing of the~
l bypass circuits is every eighteen (18) months pursuant to the Technical Specifications.
Verification of the manually operated valves will occur at_a frequency greater than every L
18 months, thereby providing greater assurance of the l
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appropriate status and operability of the high jacket water temperature ("HJWT") trip bypass than the other non-essential trip features.
As I view it, the testing is designed to verify that the non-essential trip features will not actuate in the event of an emergency start and the procedural verification of bypass valve closure is the functional equivalent to the testing of the other non-
,s essential trip feature -
4.
Position 7 of Reg. Guide 1.9 requires alarming in the control room of " abnormal values of all bypass parameters,"
as quoted above.
The " parameter" associated with the HJWT trip and the high jacket cooling water inlet and outlet alarms is jacket water temoerature.
Abnormal values of high jacket water temperature is retcined, consistent with the Regulatory Guide, and will continue to be alarmed locally and in the control room (i.e., jacket water temperature over 190*F is considered an abnormal value of jacket water temperature).
5.
It is my opinion that the HJWT trip bypass at the VEGP complies with Reg. Guide 1.9, position 7 (Rev.'2).- A potential design change to automatically bypass the HJWT trip Jupon emergency start signal would result in a HJWT trip logic more analogous to the trip logic for other non-essential 4
a s I
diesel generator trip features but is not required to comply with position 7.
The foregoing is true and correct to the best of my knowledge and belief.
J
'Kenneth C.
Stokes sworn to and subscribed before me this 16 day of 1%in nb
, 1991.
OsuA NQary Public Notary Public, ENrke County, Georgd My Comm'ssen boires Oct. 26,1992, (SEAb) a l
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