ML19350B353
| ML19350B353 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 02/02/1981 |
| From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-17, NUDOCS 8103200313 | |
| Download: ML19350B353 (6) | |
Text
-
c Jersey Central Power & Light Company 2 E '- - -
[I" ('
Mornstown. New Jersey 07960 Mad: son Avenue at Punch Bowl Road (201)455-8200 February 2, 1981 p\\$
es Mr. Boyce H. Grier
/
Office of Inspection and Enforcement b' ff[
I
'b United States Nuclear Regulatory Commission IfBg IOOI A Region I g
,8.g kgg 531 Park Avenue King of Prussia, PA 19406 b
A
Dear Mr. Grier:
O s.
'W
Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 I.E. SuIIetin No. 80-17 Supp1ement 4 The eterenced I.E. Bulletin requests detailed i n f orm at t or, concerning Installation and operation of the Scram Dump Volume Water Level Continuous Vonitoring System (CMS). The following are responses to the specific questions in that regard:
1.
Bench Test of CMS Make available information which describes CMS design and tests performed to demonstrate system operabil'ty and sensitivity.
a)
System Description and P 'nts b)
Sensing Device Characterestics c) Calibration Criteria and Losses Resconse items a) through c) were transmitted to the NRC via General Electric Company representatives who are the suppliert of the Oyster Creek CMS system. Our letter from General Electric dated 12/29/80, (G-EN-0-211), G. Nelson to D. Ross indicated that transmittal was made to Mr. W. R. Mills of the NRC I & E office, dared 12/12/80.
Item 1 d)
Training and te, ting of personnel performing the calibration tests.
Response
18 03 20e rygg Jersey Centraf Power & Lght Cornpany is a Member of the General Puoc Utit;es Systern
A Personnel perterming the field calibration of CMS units are Oyster Creek Instrument technicians. During Initial installaticn and subsequent tests and calibration, these 1.nstrument technicians were assisted by Oyster Creek Plant instrument and Electrical Engineers. Additionally General Electric Field Eng!neers were on site supporting installation efforts and providing communications with General. Electric and manufacturers systems representatives.
These Instrument' technicians who presently service CMS equipment (Two total). are those.ho were intimately involved with initial installation activities.
In this manner they received extensive training and knowledge of the system as the in-stallation problems and calibration details were developed into the present calibration procedure.
'The Oyster Creek Training Department in conjunctior.
with'the. responsible Plant Engineers are presently u
-developing a program outline to train all Oyster Creek Instrument technicians in calibration procedures and. methods' required for'this system.
- Until this program is completed only those
. technicians 1 trained during the initial installation and calibration. effort will perform work on the CMS which could affect its functional reliability.-
In addition, all-such work will ce performed under
~
.theLeagnizance of. Plant Engineering personnel until such time as t*.2 Training program is completed..
~ 2.
0PERASILITY TEST--OF CMS JConduct an' operability test within 14 days of the 'date -
of this bulletin'b'y performing _ single or multiple rod scram tests'to introduce water into' scram headers.
Determine that the transducers are adequately coupled
~
'to the SDV piping and that. trip alarm functions will perform' satisfactorily. Perform indep'endent level-measurement to' verify CMS' operation and' calibration.
Response.
e P
.a'-
j i,,
1[..
Prior to performance, plant statt personnel discussed the nature of this test with site NRC inspectors.
The condition of such a test cannot provide the appa ent quantitative results or verification requ-red. The results of the test performed proved this statement to be true.
Ho.9ver, the qual tative results obtained provided substantial empirical verification of proper coupling, proper altem function and in general verified proper operation.
The conduct of this test included the simultaneous scram of two control rows for each SDV header.
The output of the CMS mcnitor system was recorded on a brush recorder to capture respon e data. An independent ultrasonic test unit %
used by NDT personnel to visually monitor verify the response of the CMS unit.
The resuits showed that each CMS Unit responded to the introduction of water wnen rods were scrammed. As expected, tr.e cignal obtained showed the water flow was highly turbulent precluding quantitative calibration measure-ment. The independent monitor Indicated that water was seen during the same time p 3riods and that it was seen at the same relative level or depth.
It should be noted that there was Insufficient amount of water introduced anduring the test to reach the alarm setpoints.
The alarm setpoints are veri f ied during calibration of the monitors using a test vessel with actual water levels introduced.
The test vessel was constructed af the same certified material as the SDV headers and was designed with an identical geometry.
During these tests, certain unexpected results served to prove that the alarm would activate when the 1 1/4" setpoint was reached. While monitoring three SDV headers simultaneously and introducing water into one of them, it was found that water was " backing up" into a'second header after a short period of time.
The water in the second header during one test reached'the 1 1/4" level per tne brush chart recording and the alarm for that header was promptly received in the control room.
This " backing up" effect is attributed to the dynamic effects of. water flowing down
.through the headers and the geometry of the piping system. Under the test condition some of the water travels toward the drain and sane travels upstream due to pressure differences.
L
t This effect was introduced as a result of i
the unique test configuration and is of no significance during normal plant scram conditions.
The presence of water under this effect provided one - additional veri f ication ilowever, that the CMS system will operate as designed when water reaches.the alarm setpoint.
We also wish to report that the test performed prior to the 14 day period showed different response characteristics between six inch and four inch headers which was initially attributed.to geanetrical' di f ferences.
Further review-showed, however, that.re-calibration of the two six inch headers was necessary for more accurate calibration response.
This was accomplished within three days of the intial test.
3.-
INTERIM MANUAL SURVElLLANCE In the interim 14 day perlud, perform manual surveillance for the' presence of water in the SDV.
-Response
~
Independent manual surveillance was continued once per' shift as per the Bulletin requirements.
The' method used-for manual surveillance of the SDV.is-the same as has been used-forLprevious-
~SDV testing..The procedure for such surveillance--
was written, approved by, verified and conducted
-by certified NDT!r'esonnel'and is available on site.
' 4.
FULL TEST OF CMS TOLBE~ CONDUCTED-DURING:A PLANNID OUTAGE
. Response The' full test as described in' item 4.a)'throughfc) will.be performed,during.a planned outage tentatively.
scheduled during_the Spring of-1981 and in any case
~
wilI.be performed within'six months-'as prescribed:In the Bul!etin.
5.
' OPERABILITY OF CMS DURING 9EACTOR OPERATION-
-Resconse
~
The first three: paragraphs of Item 5 provide guide-Iines' which are presently 1belno followed.' Some of this guidance is co.ntained'in'an_ approved plant
. procedure for.' operator' action as'a result of
y b
receiving an SDV-CMS alarm. The remaining criteria is being administered as administrative directives when and if such "less than fully operable" conditions exist.
With respect to the specific periodic surveillance tests prescribed under item 5, these items are presently covered by our system. calibration procedure in the following way:
Item a).and b) (determining power output / response has-not been degraded-and condition of tranducer coupling) are continuously monitored by an equip-ment failure alarm in each CMS unit. This is a design feature of the CMS electronic system used at Oyster Creek.
Item c) is contained in the calibration. procedure which includes a complete electronic and alerm calibration verification.. The complete calibration is planned to be. performed on a quarterly basis.
LThe scram. test surveillance identified in the last paragraph of' Item 5 will'be performed on a semi-annual basis as prescribed.
6.
-OPERATING PROCEDURES Resoonse The previous porisons of supplement 4 responses provide the information required b'y-item six as:follows:
A.- Operator actions'en receipt of SDV. alarm are contained.in presently approved procedures.
B.
Item 5'criterla will be contained in
~
-Station Administrative' Directives.
LC. ; System calibrationsprocedures are presently approved and being utilized.
D.
The mandate-forLperiodicity of certain'
. calibration and. operability verifications will'be'affected by. placement of-these
, procedures'on the Master Surveillance schedule.
E. ! ; Manual : veri f ication procedures have been in use sinceithe' initial Issuance of.hE. Bul letin 80-17.
F.
There are no(present plans to; change
~
= :
the alarm level setpoint; however, we will notify the NRO.if such changes are contemplated prior to affecting such changes.
We believe. these responses answer-Bulletin 80-17, Supplement 4 requests and. required actions.
If additional information or clarification is required please contact Mr. Michael Laggart of my staff at 509-693-6932.
Very truly yours, I-
/ As jdHNu.JilW
+
-Ivan R. Finfrbck,#.Jr.
VicePresid[nt l
. Sworn and subscribed to before me this 2nd, day of Fe h /, 1981.
s i-f6tary.polic x,
NARiL Y N,q, n..,.,
M ARYPCsucor, cc:
Director'-
MF Comm% Lu,, [c,.-
y,,
Office of. Inspection'& Enforcement U.S. Nuclear Regulatory Commission, Washington,fD. C.
20555
(
a b
8 3..%
r s
s ='