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{{#Wiki_filter:NRC FORM 366. .(7 77)LICENSEE EVENT REPORT
{{#Wiki_filter:NRC FORM 366                                                                                                                     . .
~CONTROL BLOCK: l llllllh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6l Y4444 4@l 4 01 -l 01 ol ol ol ol -l of ol@l_ 41 il il il il@l Il@o i 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBEH 25 26 LICENSE TYPE JO 57 CAT 68 CON'T 5$RCE ; x l@l l 5 l 0 l 0 l 0 l 3 l 3 l 8 @l 1 11 lo l9 l 7 l9 l@l 11 1
(7 77)           ~
?!1171n!@" o 1 7 8 60 63 DOCKET NUMBER 68 63 EVENT D ATE 74 75 REPORT DATE tIO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l VePeo was notified by the fuel vendor th.-t a potenti31 noncnnsoruntion fn 2 t., rg g o 2;o ;3 ; g its large break LOCA-ECCS Evaluation Model exists. This problem could nFfore tho no g te 1 Il clad temperature calculated for the large break LOCA-ECCS transiont -
LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)
N kn,1 t k_
CONTROL BLOCK: l 1
yd o 4l safety of the general public were not af fected.
l      l      l    l  l    lh 6
Reportable pursuant en T A 6c 1 RkI o s 10161l I lo l 71 I I.!O 8lSYSTEM CAUSE CAUSE COMP.VALVE CODE CODE SUSCODE COYPONENT CODE SU8 CODE SUBCODE e IR lC @ ] @ { @ lXlXlXlX X lX l@ U@ d @
7 o    i 8 9 l Y4444   LICENSEE CODE 4@l 4 01 -l 01 14      15 ol ol ol ol -l of ol@l_ 41 LICENSE NUMBEH                    25    26            il ilTYPE LICENSE      il il@l JO I
7 8 9 10 11 12 13 18 19 20_SEQUENTI AL OCCURRENCE REPORT REVISION LER EVENTYEAR REPORT NO.
57 CAT 68 l@
CODE TYPE N O.Qaeg/RO t 7 P- ll-11 F l3I Ld]10 11 I tr l. L--J lo_]21 22 23 24 26 27 29 29 30 31 32 A ON PL NT MET HOURS 22 S B IT D FOR b 8.SUPPLI MAN FACTURER YNl@dN@l W l1 l2 l0 l@
CON'T o 1 5$RCE ; x l@l                     l 5 l 0 l 0 l 0 l 3 l 3 l 68            8 @l 63 1 11   lo l9 l 7 l9 74l@l7511 1REPORT            ?!1171n!@
l@lNl@Z@LZ J@10 I lo I LL]@I N JJ 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l The problem is related to fuel burst calculations and the use of notentin11y nnnennenrJ i o vative clad heatup rates.
DATE        tIO 7         8                       60             63               DOCKET NUMBER                             EVENT D ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o  2      l VePeo was notified by the fuel vendor th.-t a potenti31 noncnnsoruntion fn 2 t., rg g
Reanalysis for the LOCA-ECCS neak clnd t onn o r, tii vo , , q ,, g I;i ;i i , g a more recent evaluation model is in progress.
;o ;3 ; g its large break LOCA-ECCS Evaluation Model exists. This problem could nFfore tho no g te 1 o  4      l clad temperature calculated for the large break LOCA-ECCS transiont -                                                                   N kn,1 t k_ yd             I o   s      l safety of the general public were not af fected.                                               Reportable pursuant en T A 6c 1 RkI 10161l                                                                                                                                                                             I I
I I u_La_J l 1 i 4 80 7 8 9 S% POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION
lo l 71 I                                                                                                             .
[TTsl b@0 l 010 l@lNA llD l@lNotification from Vendor lACTIVITY CO TENT REL SED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE g lZ llNAllNA 1 6__7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NU ER TYPE DESCRIPTION FiTTl 1 0 0l@lZl@llPERSONNE L INJURIES NU 9ER DESCRIPTION h I 10l01@li R Q " 80 7 8 9 11 12 l UU LOSS OF OR DAMAGE TO FACILITY 43 TYPE D E SC Rip TION 1 ./ / vl Z gllNA i 9 7 8 9 10 80*ISSUEf@ DESCRIPTION LN_lNAllllllllllllllg 2 o 7 8 9 to 68 69 80 5 P g_g NAME OF PREPARER ", ", 1 -;;righ;
8                                                                                                                                                                          !
:.Virginia Electric and Power Company North Anna Power Station, Unit 1
O         l SYSTEM                CAUSE         CAUSE                                                   COMP.         VALVE CODE                 CODE       SUSCODE                 COYPONENT CODE                 SU8 CODE         SUBCODE e
7        8 IR lC @ ] @ { @ lXlXlXlX X lX l@ U@ d @
9           10           11           12             13                           18           19             20 SEQUENTI AL                     OCCURRENCE           REPORT                     REVISION EVENTYEAR                                 REPORT NO.                           CODE               TYPE                         N O.
LER Qaeg/RO         t 7 P- l                  l-             11 F l3I               Ld]         10 11 I 29      29 tr l 30
                                                                                                                                                      . L--J 31 lo_]
32 21         22         23             24           26       27 A                     ON PL NT           MET                     HOURS 22       S B IT D       FOR b 8.         SUPPLI               MAN FACTURER YNl@dN@                       l   Z@ I          LZ J@               10 I       lo I     LL]@             N l@        lNl@            W l1 l2 l047l@
JJ         34                   35                 36           31                   40   41             42                 43             44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i  o      l The problem is related to fuel burst calculations and the use of notentin11y nnnennenrJ
  ;i ;i i vative clad heatup rates.                               Reanalysis for the LOCA-ECCS neak clnd t onn o r, tii vo , , q ,, g                                     I
        , g a more recent evaluation model is in progress.                                                                                                                         I I
u_La_J l i 4                                                                                                                                                                           1 7         8 9                                                                                                                                                                     80 S                     % POWER                         OTHER STATUS               IS O RY                           DISCOVERY DESCRIPTION
[TTsl b@                       0 l 010 l@lNA                                             l    lD l@l        Notification from Vendor                                           l ACTIVITY CO TENT REL SED OF RELEASE                               AMOUNT OF ACTIVITY                                                   LOCATION OF RELEASE 1 6 8 9 g lZ l 10 l
11 NA 44 l        l 45 NA 80 7
PERSONNEL EXPOSURES NU ER                 TYPE         DESCRIPTION FiTTl 1 0                   0l@lZl@l                                                                                                                                              l PERSONNE L INJURIES NU 9ER                 DESCRIPTION h                                                                                                                     I i R        10          l01@l12 7       8 9                   11 l1                Q " 80 LOSS OF OR     DAMAGE TO FACILITY 43 D E SC Rip TION                                                                                                                   ./ / v UU TYPE i   9     l Z gl                NA                                                                                                                                            l 80 7       8 9             10 2 o      ISSUEf@
LN_        l      NADESCRIPTION                                                                                              l      lllllllllllllg 7       8 9             to                                                                                                                 68 69                               80 5 NAME OF PREPARER ", ", 1 -;;righ;                                                                 P                    g_g
 
Virginia Electric and Power Company North Anna Power Station, Unit 1                


==Attachment:==
==Attachment:==
Page 1 of 1 Docket No. 50-338 Report No. LER/R0 79-143/01T-0 Description of the Event The fuel vendor notified Vepco on November 9,1979 that a potential nonconser-vative feature of its large break LOCA-ECCS evaluation model existed. This event is reportable pursuant to T.S. 6.9.1.8.h.
Page 1 of 1 Docket No. 50-338 Report No. LER/R0 79-143/01T-0 Description of the Event The fuel vendor notified Vepco on November 9,1979 that a potential nonconser-vative feature of its large break LOCA-ECCS evaluation model existed. This event is reportable pursuant to T.S. 6.9.1.8.h.
'Probable Conseque~nces of the ' Event This problem could affect the peak clad temperature calculated for the large break LOCA transient. The F(Q) limit may be affected.
Probable Conseque~nces of the ' Event This problem could affect the peak clad temperature calculated for the large break LOCA transient. The F(Q) limit may be affected. The health and safety of the general public were not affected by this event.
The health and safety of the general public were not affected by this event.
Cause This new discovery resulted from work performed subsequent to meetings held with the NRC on November 1 and 2,1979 concerning studies made by Oak Ridge National Laboratory. The fuel vendor determined that a nonconservative fea-ture could exist in the large break LOCA-ECCS analysis with respect to the portion of the calculation related to fuel rod burst. The existing fuel rod burst model used clad heatup rates of 25 F per second or greater. Actually, clad heatup rates could be less than the existing model. A shift in clad burst time can affect the peak clad temperature calculated for the LOCA transi-ent.
Cause This new discovery resulted from work performed subsequent to meetings held with the NRC on November 1 and 2,1979 concerning studies made by Oak Ridge National Laboratory.
Immediate Corrective Action Discussions were held with the fuel vendor with respect to reanalysis of the LOCA transient to formulate scheduled corrective actions.
The fuel vendor determined that a nonconservative fea-ture could exist in the large break LOCA-ECCS analysis with respect to the portion of the calculation related to fuel rod burst.
The existing fuel rod burst model used clad heatup rates of 25 F per second or greater.
Actually, clad heatup rates could be less than the existing model.
A shift in clad burst time can affect the peak clad temperature calculated for the LOCA transi-ent.Immediate Corrective Action Discussions were held with the fuel vendor with respect to reanalysis of the LOCA transient to formulate scheduled corrective actions.
Scheduled Corrective Action It is anticipated that the required analysis will be completed in December 1979 and the F (Q) limit modified, if required.
Scheduled Corrective Action It is anticipated that the required analysis will be completed in December 1979 and the F (Q) limit modified, if required.
Actions Taken to Prevent Recscrence Not applicable to this event.
Actions Taken to Prevent Recscrence Not applicable to this event.                                                .
.c 9 1398 OlB6}}
c 9
1398     OlB6}}

Latest revision as of 05:14, 2 February 2020

LER 79-143/01T-0:on 791109,fuel Vendor Identified Potential Problem Affecting Temp of Large Break LOCA-ECCS Evaluation Model.Caused by Erroneous Fuel Burst Calculations.Study in Progress for Peak Clad Temp
ML19210D687
Person / Time
Site: North Anna Dominion icon.png
Issue date: 11/21/1979
From: Cartwright W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19210D670 List:
References
LER-79-143-01T, LER-79-143-1T, NUDOCS 7911270451
Download: ML19210D687 (2)
v • d • e


Text

NRC FORM 366 . .

(7 77) ~

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

CONTROL BLOCK: l 1

l l l l l lh 6

7 o i 8 9 l Y4444 LICENSEE CODE 4@l 4 01 -l 01 14 15 ol ol ol ol -l of ol@l_ 41 LICENSE NUMBEH 25 26 il ilTYPE LICENSE il il@l JO I

57 CAT 68 l@

CON'T o 1 5$RCE ; x l@l l 5 l 0 l 0 l 0 l 3 l 3 l 68 8 @l 63 1 11 lo l9 l 7 l9 74l@l7511 1REPORT  ?!1171n!@

DATE tIO 7 8 60 63 DOCKET NUMBER EVENT D ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l VePeo was notified by the fuel vendor th.-t a potenti31 noncnnsoruntion fn 2 t., rg g

o ;3 ; g its large break LOCA-ECCS Evaluation Model exists. This problem could nFfore tho no g te 1 o 4 l clad temperature calculated for the large break LOCA-ECCS transiont - N kn,1 t k_ yd I o s l safety of the general public were not af fected. Reportable pursuant en T A 6c 1 RkI 10161l I I

lo l 71 I .

8  !

O l SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COYPONENT CODE SU8 CODE SUBCODE e

7 8 IR lC @ ] @ { @ lXlXlXlX X lX l@ U@ d @

9 10 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISION EVENTYEAR REPORT NO. CODE TYPE N O.

LER Qaeg/RO t 7 P- l l- 11 F l3I Ld] 10 11 I 29 29 tr l 30

. L--J 31 lo_]

32 21 22 23 24 26 27 A ON PL NT MET HOURS 22 S B IT D FOR b 8. SUPPLI MAN FACTURER YNl@dN@ l Z@ I LZ J@ 10 I lo I LL]@ N l@ lNl@ W l1 l2 l047l@

JJ 34 35 36 31 40 41 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l The problem is related to fuel burst calculations and the use of notentin11y nnnennenrJ

i ;i i vative clad heatup rates. Reanalysis for the LOCA-ECCS neak clnd t onn o r, tii vo , , q ,, g I

, g a more recent evaluation model is in progress. I I

u_La_J l i 4 1 7 8 9 80 S  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION

[TTsl b@ 0 l 010 l@lNA l lD l@l Notification from Vendor l ACTIVITY CO TENT REL SED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 8 9 g lZ l 10 l

11 NA 44 l l 45 NA 80 7

PERSONNEL EXPOSURES NU ER TYPE DESCRIPTION FiTTl 1 0 0l@lZl@l l PERSONNE L INJURIES NU 9ER DESCRIPTION h I i R 10 l01@l12 7 8 9 11 l1 Q " 80 LOSS OF OR DAMAGE TO FACILITY 43 D E SC Rip TION ./ / v UU TYPE i 9 l Z gl NA l 80 7 8 9 10 2 o ISSUEf@

LN_ l NADESCRIPTION l lllllllllllllg 7 8 9 to 68 69 80 5 NAME OF PREPARER ", ", 1 -;;righ; P g_g

Virginia Electric and Power Company North Anna Power Station, Unit 1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER/R0 79-143/01T-0 Description of the Event The fuel vendor notified Vepco on November 9,1979 that a potential nonconser-vative feature of its large break LOCA-ECCS evaluation model existed. This event is reportable pursuant to T.S. 6.9.1.8.h.

Probable Conseque~nces of the ' Event This problem could affect the peak clad temperature calculated for the large break LOCA transient. The F(Q) limit may be affected. The health and safety of the general public were not affected by this event.

Cause This new discovery resulted from work performed subsequent to meetings held with the NRC on November 1 and 2,1979 concerning studies made by Oak Ridge National Laboratory. The fuel vendor determined that a nonconservative fea-ture could exist in the large break LOCA-ECCS analysis with respect to the portion of the calculation related to fuel rod burst. The existing fuel rod burst model used clad heatup rates of 25 F per second or greater. Actually, clad heatup rates could be less than the existing model. A shift in clad burst time can affect the peak clad temperature calculated for the LOCA transi-ent.

Immediate Corrective Action Discussions were held with the fuel vendor with respect to reanalysis of the LOCA transient to formulate scheduled corrective actions.

Scheduled Corrective Action It is anticipated that the required analysis will be completed in December 1979 and the F (Q) limit modified, if required.

Actions Taken to Prevent Recscrence Not applicable to this event. .

c 9

1398 OlB6

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