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| number = ML20072S281
| number = ML20072S281
| issue date = 09/02/1994
| issue date = 09/02/1994
| title = Responds to RAI Made During 940803 Conference Call Re TS Change Request 218 Dtd 940512.APRM Surveillance Data & Regression Analysis Computations Encl.Revised TS Pages in Sections 3.1 & 4.1 Affected by License Amend 169 Also Encl
| title = Responds to RAI Made During 940803 Conference Call Re TS Change Request 218 .APRM Surveillance Data & Regression Analysis Computations Encl.Revised TS Pages in Sections 3.1 & 4.1 Affected by License Amend 169 Also Encl
| author name = Keaten R
| author name = Keaten R
| author affiliation = GENERAL PUBLIC UTILITIES CORP.
| author affiliation = GENERAL PUBLIC UTILITIES CORP.
Line 20: Line 20:
=Text=
=Text=
{{#Wiki_filter:'
{{#Wiki_filter:'
1
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Forked River, New Jersey 08731-0388 609 971-4000 Writer's Direct Dial Number:
Forked River, New Jersey 08731-0388 l 609 971-4000                       !
)
Writer's Direct Dial Number:       )
September 2,1994 5000 94-0037-C321-94-2022 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Gentlemen:
September 2,1994 5000 94-0037-                   '
C321-94-2022 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Gentlemen:


==Subject:==
==Subject:==
Oyster Creek Nuclear Generating Station Docket No. 50-219 Facility Operating License .No. DPR-16 Response to Request for Additional Information Re: Technical Specification Change Request No. 218 dated May 12,1994 This letter is in response to the conference call with members of my staff conducted with Mr. Alex Dromerick and Mr. Sang Rhow of the NRC staff on August 3,1994. At that time, the APRM (Average Power Range Monitor) scram setpoint drift analysis supporting our request to revise the Channel Calibration interval from weekly to quarterly was requested. The approach taken in the analysis was to determine if high confidence exists that the Technical Specification limit would not be exceeded for the increased surveillance interval based on actual surveillance data. Attached to this letter are the APRM surveillance data (Attachment 1) and regression analysis computations (Attachment 2).
Oyster Creek Nuclear Generating Station Docket No. 50-219 Facility Operating License.No. DPR-16 Response to Request for Additional Information Re: Technical Specification Change Request No. 218 dated May 12,1994 This letter is in response to the conference call with members of my staff conducted with Mr. Alex Dromerick and Mr. Sang Rhow of the NRC staff on August 3,1994. At that time, the APRM (Average Power Range Monitor) scram setpoint drift analysis supporting our request to revise the Channel Calibration interval from weekly to quarterly was requested. The approach taken in the analysis was to determine if high confidence exists that the Technical Specification limit would not be exceeded for the increased surveillance interval based on actual surveillance data. Attached to this letter are the APRM surveillance data (Attachment 1) and regression analysis computations (Attachment 2).
In the regression analysis, the slope (b) and intercept (a) of the regression line were computed based on the surveillance data (Y-axis) and the time interval between the surveillances (X-axis). The analysis follows:
In the regression analysis, the slope (b) and intercept (a) of the regression line were computed based on the surveillance data (Y-axis) and the time interval between the surveillances (X-axis). The analysis follows:
o     Using the 'a' and 'b' (i.e., intercept and slope) values, the surveillance results are predicted at 3 months plus 25% margin (90 + 22.5 = 112.5 days) as follows:
o Using the 'a' and 'b' (i.e., intercept and slope) values, the surveillance results are predicted at 3 months plus 25% margin (90 + 22.5 = 112.5 days) as follows:
ig=a+b*xg , where xg = 112.5 days o      Variance, s2 (i g), and standard deviation, s(t g), of the predicted value, im, are calculated from the regression estimate, t, at 112.5 days.
ig=a+b*xg, where xg = 112.5 days Variance, s (i ), and standard deviation, s(t ), of the predicted value, 2
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g im, are calculated from the regression estimate, t, at 112.5 days.
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$          C321-94-2022 Page 2 1
C321-94-2022 Page 2 1
l o    The 95% confidence range of the predicted value,t g), is calculated using student-t distribution and standard deviation of the predicted value as     l follows-                                                                   i 1
l The 95% confidence range of the predicted value,t ), is calculated using o
I
g student-t distribution and standard deviation of the predicted value as follows-I
$                        i)o t gm)
* s(i )), for one-sided t and N-2 degrees of freedom i) t o
* s(i )),
gm) g This methodology is based on " Applied Statistics for Engineers" by William Volk (Second Edition), published by Robert E. Krieger Publishing Company, Huntington. New York, 1
g for one-sided t and N-2 degrees of freedom This methodology is based on " Applied Statistics for Engineers" by William Volk (Second ,
1980. Also, this methodology was used for revisions to Three Mile Island Unit 1 Technical Specifications extending the interval for performance of selected surveillances to coincide with a 24-month operating cycle. The NRC staff has approved this methodology in " Safety Evaluation by the Office of Nuclear Reactor Regulation Related to Amendment No.175 to Facility Operating License No. DPR-50" transmitted by NRC {{letter dated|date=June 23, 1993|text=letter dated June 23,1993}}. See paragraph 2.2 of the Safety Evaluation.
;          Edition), published by Robert E. Krieger Publishing Company, Huntington. New York,       1 1980. Also, this methodology was used for revisions to Three Mile Island Unit 1 Technical Specifications extending the interval for performance of selected surveillances to coincide with a 24-month operating cycle. The NRC staff has approved this methodology in " Safety Evaluation by the Office of Nuclear Reactor Regulation Related to Amendment No.175 to Facility Operating License No. DPR-50" transmitted by NRC letter dated June 23,1993. See paragraph 2.2 of the Safety Evaluation.
EVALUATION OF DATA & RESULTS
EVALUATION OF DATA & RESULTS Attachment 1 contains surveillance test and calibration data for the scram function pertaining to all eight APRM channels.
' contains surveillance test and calibration data for the scram function pertaining to all eight APRM channels.
I         For APRM scram channels 1,3,4,5,6 & 8, AS-FOUND data for 25 weeks was within the i
I For APRM scram channels 1,3,4,5,6 & 8, AS-FOUND data for 25 weeks was within the specified tolerance and the AS-LEFT setpoint was adjusted only two times. These i
specified tolerance and the AS-LEFT setpoint was adjusted only two times. These instances were for channel 4 (4/5/93) and channel 1 (9/26/93) where the AS-LEFT setpoint was adjusted although the AS-FOUND value was within the acceptance criteria in the surveillance procedure. Again,25 weeks of AS-FOUND data for these channels was within the acceptance criteria. Hence, these channels are considered acceptable for a quarterly Channel Calibration surveillance interval versus the current frequency of once every week.                                                                         l l
instances were for channel 4 (4/5/93) and channel 1 (9/26/93) where the AS-LEFT setpoint was adjusted although the AS-FOUND value was within the acceptance criteria in the surveillance procedure. Again,25 weeks of AS-FOUND data for these channels was within the acceptance criteria. Hence, these channels are considered acceptable for a quarterly Channel Calibration surveillance interval versus the current frequency of once every week.
The setpoint for APRM scram channels 2 and 7 drifted outside the AS-FOUND acceptance criteria on three occasions (the Technical Specification limit was exceeded
l The setpoint for APRM scram channels 2 and 7 drifted outside the AS-FOUND acceptance criteria on three occasions (the Technical Specification limit was exceeded twice) over 25 surveillances for each channel, i.e.,3 times exceeding AS-FOUND acceptance criteria out of a total of 50 surveillances for these channels. The setpoints were adjusted to bring them within AS-LEFT criteria. Channels 2 and 7 are in different trip systems. Since all eight channels are identical in terms of hardware and function and as they share a common environment, four channels per trip system can be combined to determine a 95% Confidence Interval. As a simplified approach which provides conservative results, only the two channels whose setpoints were found outside
;        twice) over 25 surveillances for each channel, i.e.,3 times exceeding AS-FOUND
;        acceptance criteria out of a total of 50 surveillances for these channels. The setpoints were adjusted to bring them within AS-LEFT criteria. Channels 2 and 7 are in different
  ;      trip systems. Since all eight channels are identical in terms of hardware and function and as they share a common environment, four channels per trip system can be combined to determine a 95% Confidence Interval. As a simplified approach which provides conservative results, only the two channels whose setpoints were found outside


i 4
i 4
C326-94-2022 Page 3 AS-FOUND acceptance criteria were analyzed using the regression model by combining the two sets of data in a single analysis (see Attachment 2). Accordingly, for the combined channels 2 and 7, the 95% Confidence Interval is as follows:
C326-94-2022 Page 3 AS-FOUND acceptance criteria were analyzed using the regression model by combining the two sets of data in a single analysis (see Attachment 2). Accordingly, for the combined channels 2 and 7, the 95% Confidence Interval is as follows:
112.92 to 115.22% - This range exceeds the AS-FOUND criteria in the surveillance procedure but is well within the Technical Specification limit.
112.92 to 115.22% - This range exceeds the AS-FOUND criteria in the surveillance procedure but is well within the Technical Specification limit.
l NOTE:       AS FOUND Requirement -                       113 to 115% Reactor Power TECHNICAL SPECIFICATION Limit -             s115.7% Reactor Power l       Thus, there exists a 95% confidence that the Technical Specification limit will not be i       exceeded.
l NOTE:
l
AS FOUND Requirement -
!      Also enclosed as Attachment 3 are revised Technical Specification pages in Sections 3.1 and 4.1 which were affected by License Amendment No.169. That amendment deleted the scram and isolation functions of the main steam line radiation monitor (MSLRM).
113 to 115% Reactor Power TECHNICAL SPECIFICATION Limit -
s115.7% Reactor Power l
Thus, there exists a 95% confidence that the Technical Specification limit will not be i
exceeded.
l Also enclosed as Attachment 3 are revised Technical Specification pages in Sections 3.1 and 4.1 which were affected by License Amendment No.169. That amendment deleted the scram and isolation functions of the main steam line radiation monitor (MSLRM).
The affected pages are 3.1-5, 3.1-6, 3.1-9, 3.1-10, 3.1-13 and 4.1-4. Page 3.1-6 is revised only as a result of pagination. These changes have been reviewed and approved by the NRC staff and do not alter Technical Specification Change Request No. 218 conclusions.
The affected pages are 3.1-5, 3.1-6, 3.1-9, 3.1-10, 3.1-13 and 4.1-4. Page 3.1-6 is revised only as a result of pagination. These changes have been reviewed and approved by the NRC staff and do not alter Technical Specification Change Request No. 218 conclusions.
A reliability assessment was performed and documented in General Electric Report NEDO-31400A, " Safety Evaluation for Eliminating The Boiling Water Reactor Main Steam Line Isolation Valve Closure Function and Scram Function of the Main Steam Line Radiation Monitor", October 1992 which addresses the effect on scram and isolation reliability of eliminating MSLRM scram and isolation functions. The               :
A reliability assessment was performed and documented in General Electric Report NEDO-31400A, " Safety Evaluation for Eliminating The Boiling Water Reactor Main Steam Line Isolation Valve Closure Function and Scram Function of the Main Steam Line Radiation Monitor", October 1992 which addresses the effect on scram and isolation reliability of eliminating MSLRM scram and isolation functions. The assessment is documented on page 25/26 of NEDO-31400A.
assessment is documented on page 25/26 of NEDO-31400A.
Sincerely, l
Sincerely, l
l l                                                  R. W. Keaten Vice President and Director                     '
l R. W. Keaten Vice President and Director Technical Functions l
Technical Functions l
l cc: Administrator, NRC Region I l
l cc: Administrator, NRC Region I l         NRC Senior Resident Inspector, Oyster Creek Oyster Creek NRC Project Manager l
NRC Senior Resident Inspector, Oyster Creek Oyster Creek NRC Project Manager l
l l
l l


d 4
d 4
Attachment 1 i
1
1 I
l l


FUNC110N:                                             APRhl                                           NITACHMENT1                                                                             .
FUNC110N:
INSTRUh1ENI': APRh11-8 PROCEDURE: 620.3.003                                                                                                             SECilON:               TEST DATA StIEET(E2-2 UE2-5) -
APRhl NITACHMENT1 INSTRUh1ENI': APRh11-8 PROCEDURE: 620.3.003 SECilON:
DATA SCRAh! SETFOINT AS FOUND                                                     AS 1.ElT I14 +/- 1%                                               (113 to 115)
TEST DATA StIEET(E2-2 UE2-5) -
APRh1                                                   APRhi DATE                                   1     4     2           3       5         8     6       7     1       4     2       3         5     8     6               7 4/5S3                           113.5   115 112.5       113       113       113 113.5   112.5 113.5     114   113     113       113   113 113.5         113 4/12B3                               114 114.5 113.5     113.5       113       113 113.5     113   114   114.5 113.5   113.5       113   113 113.5         I13 4/1963                               114   114   114       114     113.5     113.5   114     113   114     114   114     114     113.5 113.5   114         113 4/26S 3                               114   114 113.5       114     113.5     113.5 113.5     113   114     114 113.5     114     113.5 113.5 113.5         113 5/2/93                             114   114 113.5       113     113.5       113   113     113   114     114 113.5     113     113.5   113   113         113 5/1Q93                                 113 114.5 113.5       113       114       113   114     114   113   114.5 113.5     113       114   113   114         114 5/1733                                 113 114.5 113.5     113.5       114     113.5   114     114   113   114.5 113.5   113.5       114 113.5   114         114 5/24S3                               113.5 114.5   113     113.5       114       113   114     114 113.5   114.5   113   113.5       114   113   114         114 5/3163                                 114 114.5   114     113.5     114.5     113.5   114     114   114   114.5   114   113.5     114.5 113.5   114         114 6/7/93                             114 114.5   113       113       114       113   114   113.5     114   114.5   113     113       114   113   114 113.5 6/14/93                               114 114.5 113.5     113.5       114       113   114     114   114   114.5 113.5   113.5       114   113   114         114 6/2163                                 114 114.5   116       114       115     114.5   115     116   114   114.5   115     114       115 114.5   115           115 6/28/93                               114 113.5   114       114     113.5     113.5   114   113.5   114   113.5   114     114     113.5 113.5   114         114 7/563                             114   114   114       114       114     113.5   114     114   114     114   114     114       114 113.5   114         114 7/12/93                             113.5   114   114       114       114       113   113     113 113.5     114   114     114       114   113   113         113 7/19/93                               114 113.5 113.5       114       114       113 113.5   113.5   114   113.5 113.5     114       114   113 113.5 113.5 7/26/93                               114   114 113.5       114       114     -113 113.5   113.5   114     114 113.5     114       114   113 113.5   113.5 8/1/93                             114   113   114       114       114     113.5   114     114   114     114   114     114       114 113.5   114           114 8/8/93                             114 113.5   114       114       114       113 113.5     114   114   113.5   114     114       114   113 113.5           114 8/12/93                                                                           113                                                           113 8/15S3                                 114   114   114     113.5       114       113   114     114   114     114   114   113.5       114   113   114         114 8/22/93                               114   114 113.5     113.5     113.5     113.5   114     114   114     114 113.5   113.5     113.5 113 5   114           114 OC Surveillance
DATA SCRAh! SETFOINT AS FOUND AS 1.ElT I14 +/- 1%
(113 to 115)
APRh1 APRhi DATE 1
4 2
3 5
8 6
7 1
4 2
3 5
8 6
7 4/5S3 113.5 115 112.5 113 113 113 113.5 112.5 113.5 114 113 113 113 113 113.5 113 4/12B3 114 114.5 113.5 113.5 113 113 113.5 113 114 114.5 113.5 113.5 113 113 113.5 I13 4/1963 114 114 114 114 113.5 113.5 114 113 114 114 114 114 113.5 113.5 114 113 4/26S 3 114 114 113.5 114 113.5 113.5 113.5 113 114 114 113.5 114 113.5 113.5 113.5 113 5/2/93 114 114 113.5 113 113.5 113 113 113 114 114 113.5 113 113.5 113 113 113 5/1Q93 113 114.5 113.5 113 114 113 114 114 113 114.5 113.5 113 114 113 114 114 5/1733 113 114.5 113.5 113.5 114 113.5 114 114 113 114.5 113.5 113.5 114 113.5 114 114 5/24S3 113.5 114.5 113 113.5 114 113 114 114 113.5 114.5 113 113.5 114 113 114 114 5/3163 114 114.5 114 113.5 114.5 113.5 114 114 114 114.5 114 113.5 114.5 113.5 114 114 6/7/93 114 114.5 113 113 114 113 114 113.5 114 114.5 113 113 114 113 114 113.5 6/14/93 114 114.5 113.5 113.5 114 113 114 114 114 114.5 113.5 113.5 114 113 114 114 6/2163 114 114.5 116 114 115 114.5 115 116 114 114.5 115 114 115 114.5 115 115 6/28/93 114 113.5 114 114 113.5 113.5 114 113.5 114 113.5 114 114 113.5 113.5 114 114 7/563 114 114 114 114 114 113.5 114 114 114 114 114 114 114 113.5 114 114 7/12/93 113.5 114 114 114 114 113 113 113 113.5 114 114 114 114 113 113 113 7/19/93 114 113.5 113.5 114 114 113 113.5 113.5 114 113.5 113.5 114 114 113 113.5 113.5 7/26/93 114 114 113.5 114 114
-113 113.5 113.5 114 114 113.5 114 114 113 113.5 113.5 8/1/93 114 113 114 114 114 113.5 114 114 114 114 114 114 114 113.5 114 114 8/8/93 114 113.5 114 114 114 113 113.5 114 114 113.5 114 114 114 113 113.5 114 8/12/93 113 113 8/15S3 114 114 114 113.5 114 113 114 114 114 114 114 113.5 114 113 114 114 8/22/93 114 114 113.5 113.5 113.5 113.5 114 114 114 114 113.5 113.5 113.5 113 5 114 114 OC Surveillance


                                                                                                                                                                                                        , i FUNC110N:     APitM                                                           ATTACIIMENT 1                                                                                                     -
i FUNC110N:
INSTilUMENT: Al'ItM l-8                                                                                                                                                                               t
APitM ATTACIIMENT 1 INSTilUMENT: Al'ItM l-8 t
                                                                                                                                                                                                      ~
PitOCEDURE: 620.3.003 SECllON:
PitOCEDURE: 620.3.003                                                                                                 SECllON:                             TESTDATA SIIEET(E2-2 E2-5)
TESTDATA SIIEET(E2-2 E2-5)
DATA SCRAM SEFIDINT AS IOUND                                                                                       AS LEFT                                                 ;
~
I14 +/- 17c                                                                                 (113 to ,115)
L DATA SCRAM SEFIDINT AS IOUND AS LEFT I14 +/- 17c (113 to,115)
APRM                                                                                         APRM                                                   +
APRM APRM
DATE             1     4         2       3         5                   8                 6           7       1       4           2               3       5     8       6         7 8/29/93       114     114     114       114     113.5                 113             114         113.5     114     114         114         114       113.5   113     114     113.5 9/5/93       114   113.5     113       113       114                 113           113.5         113.5     114   113.5         113         113         114   113   113.5     113.5         ;
+
9/12/93       114 113.5 113.5         114     113.5             113.5               114           114     114   113.5     113.5           114       113.5 113.5     114       114 9/26/93       115   113.5 113.5       113.5       114                 113           113.5           114     114   113.5     113.5       113.5           114   113   113.5       114 I
DATE 1
4 2
3 5
8 6
7 1
4 2
3 5
8 6
7 i
8/29/93 114 114 114 114 113.5 113 114 113.5 114 114 114 114 113.5 113 114 113.5 9/5/93 114 113.5 113 113 114 113 113.5 113.5 114 113.5 113 113 114 113 113.5 113.5 9/12/93 114 113.5 113.5 114 113.5 113.5 114 114 114 113.5 113.5 114 113.5 113.5 114 114 9/26/93 115 113.5 113.5 113.5 114 113 113.5 114 114 113.5 113.5 113.5 114 113 113.5 114 I
1
1
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ATTACHMENT 2 APRM CilANNEl. 2 & 7 COMBINID l't.OW INDUCfD SCRAM SURVEll.1ANCE
ATTACHMENT 2 APRM CilANNEl. 2 & 7 COMBINID l't.OW INDUCfD SCRAM SURVEll.1ANCE DATA Ell.2&Ull 01 1 Of[
                                                                    ~ ' ' ~ ~ ~
gy
                                                                                          - ' = = = = =
=} g=='9gg-g, g
DATA                                 Ell.2&Ull 01 1 Of[                           <
~ ' ' ~ ~ ~
      =} g=='9gg-                     g, g                                                                                                               gy                                  l ELAPSED      DATA x            y                                                                                                              v^ = v liSTIMATED Channel 217 y ^ = a + bX       x-AVOx       (x- AVGx) ^ 2 y-AYGy             (y- AVGy)^ 2 (s-AVGs)*             y-y^       (y-y")^2 S
- ' = = = = =
E* "'.     5             ._                                                              9             __
ELAPSED DATA x
12- Apr -95               7         113.5   in629eS79:5 - 32.679245         1067.93307 - 0.2641509           0.00977572   8.63225347 - 0.1290579           0.oi6cdwm 19- Apr-95               14           114   113.657995 - 25.679245         659.423638         0.23584905   0.05562477 - 6.0564257         0.34200471     0.11696722 26- Apr-95             21         113.5   113.686932 - 18.679245         348.914204 - 0.2641509           0.06977572   4.93414026 - 0.1869326           0.03494381 02- May-95             27         113.5   113.711736 - 12.679245         160.763260 - 0.2641509           0.06977572   3.34923460 - 0.2117361           0.M483217 10- May-95             35         113.5   113.744807 - 4.6792452         21.8953364 - 0.2641509           0.06977572   1.2 % 02705 - 0.2448073         0.05993064 17- May-95             42         113.5   113.773744     2.32075471     5.38590245 - 0.2641509           0.06977572 - 0.6130295 - 0.2737447             0.07493617 24- May-95             49             113   113.802682     9.32075471     86.8764684 - 0.7644509           0.58392666 - 7.1224635 - 0.8026820             0.64429854 31-May-95               56             114   113.831619     16.3207547     266.367034         0.23584905   0.05562477   3.84923460       0.16838054     0.02835200 07-Jun-95             63             113   113.860556     23.3207547     543.857600 - 0.7641509           0.58392666 - 17.820576 - 0.8605568             0.74055803 14-J un-95             70         113.5   113.889494     30 3207347     919.348166 - 0.2641509           0.06977572 - 8.0092559 - 0.3894941             0.15170571 21 -J un-95           77             Ito   113.91M31       37.3207547     1392.83873         2.23584905   4.99902100   83.4435742       2.08156846     4.33292726 21-Jun-95               0           115   113.600120 - 39.679245         1574.44250         1.23584905   1.52732289 - 49.037557         1.39987943     1.95 % 6243 28-J un-95               7           114   113.629057 - 32.679245         1067.93307         0.23584905   0.05562477 - 7.7073691         0.37094207     0.13759802 05-Jul-95               14           114   113.657995 - 25.6'9245         659.423638         0.23584905   0.05562477 - 6.0564257         0.34200471     0.11696722 12-Jul-95             21             114   113.686932 - 18.679245         348.914204         0.23584905   0.05562477 - 4.4054823         0.31306735     0.09801116 19- J ul-95           28         113.5   113.715870 - 11.679245         136.404770 - 0.2641509           0.06977572   3.08508M5 - 0.2158700           0.04659986             '
y v^ = v liSTIMATED Channel 217 y ^ = a + bX x-AVOx (x-AVGx) ^ 2 y-AYGy (y-AVGy)^ 2 (s-AVGs)*
26-Jul-95             35         113.5   113.744807 - 4.6792452         21.8953364 - 0.2641509           0.06977572   1.23602705 - 0.2448073           0.05993064 l     01 - Aug-95             41             114   113.76 % 10     1.32073471     1.74439302         0.23584905   0.05562477   0.31149875       0.23038917     0.05307917 l     Ok- Aug-95             48             114   113.798548     8.32075471     69.2349590         0.23584905   0.05562477   1 96244215       0.20145181     0.04058283 15- Aug -95             55             114   113.827485     15.3207547     234.725525         0.23584905   0.05562477   3.61338554       0. t"$ 1445     0.02976123 22- Aug-95             62         113.5   113.856422     22.3207547     498.216091         - 0.2641509   0.06977572 - 5.8960484 - 0.3564229             0.12703728 29- Aug -95             60             114   113.885360     29.3207547     859.706657         0.23584905   0.05562477   6.91527233       0.11463973     0.01314226 05- Sep-95             76           113   113.914297     36.3207547     1319.19722 - 0.7641509           0.58392666 - 27.754538 - 0.9142976             0.83594015 12- Sep-95             83         113.5   113.943234     43.3207547     1876.68778 - 0.2641509           0.06977572 - 11.443218 - 0.4432349             0.19645725 26- Sep-95             97         113.5   114.001 09     57.3207547     3285.(M92         - 0.2641509   0.06977572 - 15.141331       - 0.5011097     0.25111094
y-y^
(           4/5/93               0           113   113.600120 - 39 679245         1574.44250 - 0.7641509           0.58392666   30.3209327 - 0.6001205           0.%014469 l         4/12h3               7           !!3   113.629057 - 32.679245         1067.93307 - 0.7641509           0.58392666   24.9718761     - 0.6290579     0.39571387
(y-y")^2 E* "'.
,          4fl9/93             14           113   113.65 7995 - 25.679245         659.423638 - 0.7641500           0.58392666   19.6228195 - 0.6579952           0.43295779 I         4,26S3               21           113   113M6932 - 18.679245           348.914204         - 0.7641509   0.58392666   14.2737629 - 0.6869326           0.47187646 l           5,2/93             27           113   113.7117 % - 12.679245         160.763260 - 0.7641509           0.58392666   9.68885724 - 0.7117361           0.50656827 5/1093               35           114   113.744807 - 4.6792452         21.8953M4           0.23584905   0.05562477   -1.1035955       0.25519262     0.06512327 5/17/93             42           114   113.773744     2.32073471     5.38590245         0.23584905   0.05562477   0.5A734781       0.22625526     0.05119144 5/2493               49           114   113.802682     9.32075471     86.8764684         0.23584905   0.05562477   2.19829120       0.19731790     0.0389M 35 5/31/93             56           114   113.831619     16.3207547     266.367034         0.23584905   0.05562477   3.84923460       0.16838054     0.02835200 67/93               63         113.5   113.860556     23.3207547     543.857600 - 0.2641509           0.06977572 - 6.1601993 - 0.3605568             0.13000121 6/14 93             70           114   113.889494     30.3207547     919.348166         0.23584905   0.05362477   7.15112139       0.11050582     0.01221153             ,
5 9
621S3               77             116   113.918431     37.3207547     1392.83873         2.23584905   4.99902100   83.4435742       2.08156846     4.33292726 6,21/93               0             !!5   113.600120 - 39.679245         1574.44250         1.23584905   1.52732289   -49.037557       1.39987943 1.95 % 6243
S 12-Apr -95 7
!          6,2893               7         113.5     113.629057 - 32.679245         1067.93307 - 0.2641509           0.06977572   8.63225347 - 0.1290579           0.01665594 6/28N3               0           114   113.600120 - 39.679245         1574.44250         0.23584905   0,05562477 - 9.3583125         0.39987943     0.15990356 7/5/93               7           114   113.629057 - 32.679245         1067.93307         0.23584905   0.05562477 - 7.7073691         0.37094207     0.13759802 7/12/93             14           113   113.657995 - 25.679245         659.423638 - 0.7641509           0.58392666   19.6228195 - 0.6579952           0.43295779 7/1943               21         113.5     ll3 M 6932 - 18.679245         348 914204 - 0.2641500           0.06077572   4,93414026 - 0.1869326           0.03494381 7126 9 3             28         113.5     113.715870 - 11.679245         1% 404770         -0.2M1509     0.06077572   3.08508365     - 0.2158700     0.04659986 8/1/93             34             114   113.740673 - 5.6792452         32.2538269         0.23584905   0 05562477   -1.3394446       0.25932653     0.06725025 8/8/93             41             114   113.76 % 10     1.32075471     1.74439.302       0.23584905   0.05562477   0.31149875       0.23038917     0.05307917 8/15N3               48             114   113.79M548     8.32075471     69.2349590         0.23584905   0.05562477   1.96244215       0.20145181     0.04058283 8/22 S 3             55             114   113.827485       15.3207547   234.725525         0.23584905   0.05562477   3.61338554       0.17251445     0.02976123               l 8.2983               62         113.5     113.856422     22.3207547     49&216091 - 0.2641509             0.06977572   ~5.8960484       - 0.3564229     0.12703728 9/5/93             69         113.5     113.885 % 0     29.3207547     859.706657 - 0.2641509           OM977572 - 7.7451050 - 0.3853602               0.14850253 9/12N3               76             114   113 914297     36.3207547     1319.19722         0.23584905   0.05562477   8.56621573       0.08570237     0.00734489
113.5 in629eS79:5 - 32.679245 1067.93307 - 0.2641509 0.00977572 8.63225347 - 0.1290579 0.oi6cdwm 19-Apr-95 14 114 113.657995 - 25.679245 659.423638 0.23584905 0.05562477 - 6.0564257 0.34200471 0.11696722 26-Apr-95 21 113.5 113.686932 - 18.679245 348.914204 - 0.2641509 0.06977572 4.93414026 - 0.1869326 0.03494381 02-May-95 27 113.5 113.711736 - 12.679245 160.763260 - 0.2641509 0.06977572 3.34923460 - 0.2117361 0.M483217 10- May-95 35 113.5 113.744807 - 4.6792452 21.8953364 - 0.2641509 0.06977572 1.2 % 02705 - 0.2448073 0.05993064 17-May-95 42 113.5 113.773744 2.32075471 5.38590245 - 0.2641509 0.06977572 - 0.6130295 - 0.2737447 0.07493617 24-May-95 49 113 113.802682 9.32075471 86.8764684 - 0.7644509 0.58392666 - 7.1224635 - 0.8026820 0.64429854 31-May-95 56 114 113.831619 16.3207547 266.367034 0.23584905 0.05562477 3.84923460 0.16838054 0.02835200 07-Jun-95 63 113 113.860556 23.3207547 543.857600 - 0.7641509 0.58392666 - 17.820576 - 0.8605568 0.74055803 14-J un-95 70 113.5 113.889494 30 3207347 919.348166 - 0.2641509 0.06977572 - 8.0092559 - 0.3894941 0.15170571 21 -J un-95 77 Ito 113.91M31 37.3207547 1392.83873 2.23584905 4.99902100 83.4435742 2.08156846 4.33292726 21-Jun-95 0
      =P3           mym      .J3._ . _ II4dl.3 94 3234             43.3207547     1876 M778         0.23584905   0.05562477     10.2171591     0.05676500     0.00322226 AVLRAGli L39 6792452J _113.764150j                                                                                                                                               _
115 113.600120 - 39.679245 1574.44250 1.23584905 1.52732289 - 49.037557 1.39987943 1.95 % 6243 28-J un-95 7
STD. DEVI:                                                                                                                                 omemana , b__y122d SUM (x- AVGx) ^ 2.                                                                                                                                 ..,9.somm3gy l[_37371.5471]
114 113.629057 - 32.679245 1067.93307 0.23584905 0.05562477 - 7.7073691 0.37094207 0.13759802 05-Jul-95 14 114 113.657995 - 25.6'9245 659.423638 0.23584905 0.05562477 - 6.0564257 0.34200471 0.11696722 12-Jul-95 21 114 113.686932 - 18.679245 348.914204 0.23584905 0.05562477 - 4.4054823 0.31306735 0.09801116 19-J ul-95 28 113.5 113.715870 - 11.679245 136.404770 - 0.2641509 0.06977572 3.08508M5 - 0.2158700 0.04659986 26-Jul-95 35 113.5 113.744807 - 4.6792452 21.8953364 - 0.2641509 0.06977572 1.23602705 - 0.2448073 0.05993064 l
SUM (y- AVGy)^ 2:                                                                                               21.3018867                   s
01 - Aug-95 41 114 113.76 % 10 1.32073471 1.74439302 0.23584905 0.05562477 0.31149875 0.23038917 0.05307917 l
* 2(y" ) = h40516150 SUM (x- AVGx)*(y- AVGy):                                                                                                       154.490566 SUM (y-y ^ ) ^2:
Ok-Aug-95 48 114 113.798548 8.32075471 69.2349590 0.23584905 0.05562477 1 96244215 0.20145181 0.04058283 15-Aug -95 55 114 113.827485 15.3207547 234.725525 0.23584905 0.05562477 3.61338554
: 0. t"$ 1445 0.02976123 22-Aug-95 62 113.5 113.856422 22.3207547 498.216091
- 0.2641509 0.06977572 - 5.8960484 - 0.3564229 0.12703728 29-Aug -95 60 114 113.885360 29.3207547 859.706657 0.23584905 0.05562477 6.91527233 0.11463973 0.01314226 05-Sep-95 76 113 113.914297 36.3207547 1319.19722 - 0.7641509 0.58392666 - 27.754538 - 0.9142976 0.83594015 12-Sep-95 83 113.5 113.943234 43.3207547 1876.68778 - 0.2641509 0.06977572 - 11.443218 - 0.4432349 0.19645725 26-Sep-95 97 113.5 114.001 09 57.3207547 3285.(M92
- 0.2641509 0.06977572 - 15.141331
- 0.5011097 0.25111094
(
4/5/93 0
113 113.600120 - 39 679245 1574.44250 - 0.7641509 0.58392666 30.3209327 - 0.6001205 0.%014469 l
4/12h3 7
!!3 113.629057 - 32.679245 1067.93307 - 0.7641509 0.58392666 24.9718761
- 0.6290579 0.39571387 4fl9/93 14 113 113.65 7995 - 25.679245 659.423638 - 0.7641500 0.58392666 19.6228195 - 0.6579952 0.43295779 I
4,26S3 21 113 113M6932 - 18.679245 348.914204
- 0.7641509 0.58392666 14.2737629 - 0.6869326 0.47187646 l
5,2/93 27 113 113.7117 % - 12.679245 160.763260 - 0.7641509 0.58392666 9.68885724 - 0.7117361 0.50656827 5/1093 35 114 113.744807 - 4.6792452 21.8953M4 0.23584905 0.05562477
-1.1035955 0.25519262 0.06512327 5/17/93 42 114 113.773744 2.32073471 5.38590245 0.23584905 0.05562477 0.5A734781 0.22625526 0.05119144 5/2493 49 114 113.802682 9.32075471 86.8764684 0.23584905 0.05562477 2.19829120 0.19731790 0.0389M 35 5/31/93 56 114 113.831619 16.3207547 266.367034 0.23584905 0.05562477 3.84923460 0.16838054 0.02835200 67/93 63 113.5 113.860556 23.3207547 543.857600 - 0.2641509 0.06977572 - 6.1601993 - 0.3605568 0.13000121 6/14 93 70 114 113.889494 30.3207547 919.348166 0.23584905 0.05362477 7.15112139 0.11050582 0.01221153 621S3 77 116 113.918431 37.3207547 1392.83873 2.23584905 4.99902100 83.4435742 2.08156846 4.33292726 6,21/93 0
!!5 113.600120 - 39.679245 1574.44250 1.23584905 1.52732289
-49.037557 1.39987943 1.95 % 6243 6,2893 7
113.5 113.629057 - 32.679245 1067.93307 - 0.2641509 0.06977572 8.63225347 - 0.1290579 0.01665594 6/28N3 0
114 113.600120 - 39.679245 1574.44250 0.23584905 0,05562477 - 9.3583125 0.39987943 0.15990356 7/5/93 7
114 113.629057 - 32.679245 1067.93307 0.23584905 0.05562477 - 7.7073691 0.37094207 0.13759802 7/12/93 14 113 113.657995 - 25.679245 659.423638 - 0.7641509 0.58392666 19.6228195 - 0.6579952 0.43295779 7/1943 21 113.5 ll3 M 6932 - 18.679245 348 914204 - 0.2641500 0.06077572 4,93414026 - 0.1869326 0.03494381 7126 9 3 28 113.5 113.715870 - 11.679245 1% 404770
-0.2M1509 0.06077572 3.08508365
- 0.2158700 0.04659986 8/1/93 34 114 113.740673 - 5.6792452 32.2538269 0.23584905 0 05562477
-1.3394446 0.25932653 0.06725025 8/8/93 41 114 113.76 % 10 1.32075471 1.74439.302 0.23584905 0.05562477 0.31149875 0.23038917 0.05307917 8/15N3 48 114 113.79M548 8.32075471 69.2349590 0.23584905 0.05562477 1.96244215 0.20145181 0.04058283 8/22 S 3 55 114 113.827485 15.3207547 234.725525 0.23584905 0.05562477 3.61338554 0.17251445 0.02976123 l
8.2983 62 113.5 113.856422 22.3207547 49&216091 - 0.2641509 0.06977572
~5.8960484
- 0.3564229 0.12703728 9/5/93 69 113.5 113.885 % 0 29.3207547 859.706657 - 0.2641509 OM977572 - 7.7451050 - 0.3853602 0.14850253 9/12N3 76 114 113 914297 36.3207547 1319.19722 0.23584905 0.05562477 8.56621573 0.08570237 0.00734489
=P3
.J3._. _ II4dl.3 94 3234 43.3207547 1876 M778 0.23584905 0.05562477 10.2171591 0.05676500 0.00322226 mym AVLRAGli L39 6792452J _113.764150j omemana, b__y122d STD. DEVI:
SUM (x-AVGx) ^ 2.
l[_37371.5471]
..,9.somm3gy s
* 2(y" ) = h40516150 SUM (y-AVGy)^ 2:
21.3018867 SUM (x-AVGx)*(y-AVGy):
154.490566 SUM (y-y ^ ) ^2:
[ [ 20.6632 % ]8 SFRAPRM2 I
[ [ 20.6632 % ]8 SFRAPRM2 I


4 ATTACHMENT 2                                                                         ,
4 ATTACHMENT 2
l
~
                                                                                                                                            ~
APR,M. CllA..N. NE1 2. & 7 COMBINI.D. l'l O. W INDl:CED SCRAM SURVIJLIANCE DATA l Ell.2&f[PAGII2 OI 2 '
l APR,M.
=
    =        CllA. .N. NE1 2. & 7 COMBINI.D. l'l O. W INDl:CED SCRAM SURVIJLIANCE DATA l Ell.2&f[PAGII2 OI 2 '
FLOW BIASED APRM SCRAM DATA 1
FLOW BIASED APRM SCRAM DATA                               1
- CHANNEL 2 & 7 COMBINED l
                                                                                                        - CHANNEL 2 & 7 COMBINED                               l Regression Output:                     ,_
Regression Output:
i l   Constant. a =                                 h_l3.600120]
i h_l3.600120]
Std firrof Y Est                                     6
l Constant. a =
                                                    ,_, 0 63652291 R Squared. r
Std firrof Y Est
* 2 =                             l 0.0299m m                             jj6   -
,_, 0 63652291 6
                                                                                                                                          ]
R Squared. r
No.of Otmervations. N =                       !              53                                                                                         ,
* 2 =
De,rees or Freedom. N-2 =                                     Si                                                                                         i 5       115 X coerricienito b =           P~~sstE601                                     6                   >                                //
l 0.0299m m jj6
Std Err of Coef.                   02653 5 I                                 C       l14F hCU . IMMM                           #" &
]
j                    wx     D-E H.3-a     /'jbd .        "1--f)
No.of Otmervations. N =
                                                                                  $        113~ W M W .- -                D     D        C D                                                                   :
53 De,rees or Freedom. N-2 =
* U 112 0    I   20  I 40    I 60     I    80 I 1bo 10     30       50       70         %
Si 5
DAYS O SURVL. DATA + REGRESSION UNE                                 ;
115 i
avo. . 39.6792452 avu.-avo.ca. 37371.5471 o VARIANCE OF ANY PREDICITD VALUE. Y(i)^.
X coerricienito b =
P~~sstE601 6
//
Std Err of Coef.
02653 5 I C
l14F hCU. IMMM 113~ W M W.- -
jbd.
wx D-E H.3-a
/'
"1--f) j D
D C
D U
112 I
I I
I 60 80 I 1bo 20 40 0
10 30 50 70 DAYS O SURVL. DATA + REGRESSION UNE avo..
39.6792452 avu.-avo.ca.
37371.5471 o VARIANCE OF ANY PREDICITD VALUE. Y(i)^.
s ^ 2(YO)* ) = s " 2(y")*{ l + (1/N) + { (AVGu -x(i))* 2 / SUM (s - AVGx)^ 2 } [
s ^ 2(YO)* ) = s " 2(y")*{ l + (1/N) + { (AVGu -x(i))* 2 / SUM (s - AVGx)^ 2 } [
                                                    %11ERE x(i) = 3 MONT}{S + 25% = 90 dan + 22.5 days = 112.5 days
%11ERE x(i) = 3 MONT}{S + 25% = 90 dan + 22.5 days = 112.5 days 0.40516150 * [ 1 + (153) + { (33.4525301 - 112.5)^ 2 / 31035.1320 } l,
                                =      0.40516150 * [ 1 + (153) + { (33.4525301 - 112.5)^ 2 / 31035.1320 } l,
=
                                =       0.47029674 o Y ^ (La x(i) + 112.5 dap) = a + b
0.47029674
=
o Y ^ (La x(i) + 112.5 dap) = a + b
* x(i)
* x(i)
Y^=         113.600120         +         02413390
Y^=
* 112.5 days
113.600120
                                =      114.065185 o  CONI 1DEWCE RANGE OF Y ^ Fi 112.5 days                                                                   _N-2 =QJ.-VAllyNE- SIDEg
+
                  =Ya pt x(i) + 112.5 dap) +/- t( ALPilA. DEGREES OFIREEDOM)* a(Y(i))                                 4n       1.684
02413390
                  =    114M5185            +/-       (.05.N-2)
* 112.5 days 114.065185
* a(Y(i)). FOR TWO-SIDED t. or                                   1671
=
CONI 1DEWCE RANGE OF Y ^ Fi 112.5 days
_N-2 =QJ.-VAllyNE-SIDEg o
=Ya pt x(i) + 112.5 dap) +/- t( ALPilA. DEGREES OFIREEDOM)* a(Y(i))
4n 1.684 114M5185
+/-
(.05.N-2)
* a(Y(i)). FOR TWO-SIDED t. or
($ _
($ _
                  =   Il4M5185            +/-
1671
=
t(.1 N-2)
t(.1 N-2)
* s(Y(i)). FOR ONE-SIDED t. %11ERE N-2(_ $1[                       L677 - BY INTERPOLATION
* s(Y(i)). FOR ONE-SIDED t. %11ERE N-2(_ $1[
                  =   114M5155           +/-                 1.677
L677 - BY INTERPOLATION Il4M5185
* SORT (       0.47029674 )
+/-
                  =   114.065185         +/-         1.15005616
=
                                                                                                                                                              ]
114M5155
                  =    112.915129          to          115.215241 A
+/-
1.677
* SORT (
0.47029674 )
=
114.065185
+/-
1.15005616
=
]
f CCE_l'! ANCE CRITERI A:
f CCE_l'! ANCE CRITERI A:
112.915129 to 115.215241 A
=
I AS-FOUND: 114 +/- 1%
I AS-FOUND: 114 +/- 1%
l TECil SPEC LIMIT: < OR = 115.7%
TECil SPEC LIMIT: < OR = 115.7%
REI ERENCES:
REI ERENCES:
                                                                                  ;o STANDING ORDER #1(R.64) lo TECil SPEC PARA. 2.3 lo PROCEDURE 620 3 001                 l CONCid'S10N TIIE COMBINED CilANNELS DO NOT SA11SFY lilE 'AS-FOUND* ACCEI'IANCE CRITERIA BUT ARE NOT IN VIOLA 110N OF TLCil SPEC LIMil.
;o STANDING ORDER #1(R.64) lo TECil SPEC PARA. 2.3 lo PROCEDURE 620 3 001 l
CONCid'S10N TIIE COMBINED CilANNELS DO NOT SA11SFY lilE 'AS-FOUND* ACCEI'IANCE CRITERIA BUT ARE NOT IN VIOLA 110N OF TLCil SPEC LIMil.
NOTES:
NOTES:
o SilADED NUMBERS SilM.L BECilECKED FOR ACCURACY o BOXED VAIXES ARE USED IN Till5 CALCULAT10N o e.g X " 2 REPRESEN13 X-squared SFRAPRM2}}
o SilADED NUMBERS SilM.L BECilECKED FOR ACCURACY o BOXED VAIXES ARE USED IN Till5 CALCULAT10N e.g X " 2 REPRESEN13 X-squared o
SFRAPRM2}}

Latest revision as of 04:23, 15 December 2024

Responds to RAI Made During 940803 Conference Call Re TS Change Request 218 .APRM Surveillance Data & Regression Analysis Computations Encl.Revised TS Pages in Sections 3.1 & 4.1 Affected by License Amend 169 Also Encl
ML20072S281
Person / Time
Site: Oyster Creek
Issue date: 09/02/1994
From: Keaten R
GENERAL PUBLIC UTILITIES CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20072S284 List:
References
5000-94-0037, 5000-94-37, C321-94-2022, NUDOCS 9409140024
Download: ML20072S281 (9)
v • d • e


Text

'

I GPU Nuclear Corporadon 4

Nuclear

=e;tr888 o

Forked River, New Jersey 08731-0388 609 971-4000 Writer's Direct Dial Number:

)

September 2,1994 5000 94-0037-C321-94-2022 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Gentlemen:

Subject:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Facility Operating License.No. DPR-16 Response to Request for Additional Information Re: Technical Specification Change Request No. 218 dated May 12,1994 This letter is in response to the conference call with members of my staff conducted with Mr. Alex Dromerick and Mr. Sang Rhow of the NRC staff on August 3,1994. At that time, the APRM (Average Power Range Monitor) scram setpoint drift analysis supporting our request to revise the Channel Calibration interval from weekly to quarterly was requested. The approach taken in the analysis was to determine if high confidence exists that the Technical Specification limit would not be exceeded for the increased surveillance interval based on actual surveillance data. Attached to this letter are the APRM surveillance data (Attachment 1) and regression analysis computations (Attachment 2).

In the regression analysis, the slope (b) and intercept (a) of the regression line were computed based on the surveillance data (Y-axis) and the time interval between the surveillances (X-axis). The analysis follows:

o Using the 'a' and 'b' (i.e., intercept and slope) values, the surveillance results are predicted at 3 months plus 25% margin (90 + 22.5 = 112.5 days) as follows:

ig=a+b*xg, where xg = 112.5 days Variance, s (i ), and standard deviation, s(t ), of the predicted value, 2

o g

g im, are calculated from the regression estimate, t, at 112.5 days.

g8l/

94o9140024 94o902 PDR ADOCK 05000219 f

PDR l

'GPU t/dckalCorporation is a subsidiary of General Pubhc Utihties Corporation i

I l

1 l

l

]-

C321-94-2022 Page 2 1

l The 95% confidence range of the predicted value,t ), is calculated using o

g student-t distribution and standard deviation of the predicted value as follows-I

  • s(i )), for one-sided t and N-2 degrees of freedom i) t o

gm) g This methodology is based on " Applied Statistics for Engineers" by William Volk (Second Edition), published by Robert E. Krieger Publishing Company, Huntington. New York, 1

1980. Also, this methodology was used for revisions to Three Mile Island Unit 1 Technical Specifications extending the interval for performance of selected surveillances to coincide with a 24-month operating cycle. The NRC staff has approved this methodology in " Safety Evaluation by the Office of Nuclear Reactor Regulation Related to Amendment No.175 to Facility Operating License No. DPR-50" transmitted by NRC letter dated June 23,1993. See paragraph 2.2 of the Safety Evaluation.

EVALUATION OF DATA & RESULTS

' contains surveillance test and calibration data for the scram function pertaining to all eight APRM channels.

I For APRM scram channels 1,3,4,5,6 & 8, AS-FOUND data for 25 weeks was within the specified tolerance and the AS-LEFT setpoint was adjusted only two times. These i

instances were for channel 4 (4/5/93) and channel 1 (9/26/93) where the AS-LEFT setpoint was adjusted although the AS-FOUND value was within the acceptance criteria in the surveillance procedure. Again,25 weeks of AS-FOUND data for these channels was within the acceptance criteria. Hence, these channels are considered acceptable for a quarterly Channel Calibration surveillance interval versus the current frequency of once every week.

l The setpoint for APRM scram channels 2 and 7 drifted outside the AS-FOUND acceptance criteria on three occasions (the Technical Specification limit was exceeded twice) over 25 surveillances for each channel, i.e.,3 times exceeding AS-FOUND acceptance criteria out of a total of 50 surveillances for these channels. The setpoints were adjusted to bring them within AS-LEFT criteria. Channels 2 and 7 are in different trip systems. Since all eight channels are identical in terms of hardware and function and as they share a common environment, four channels per trip system can be combined to determine a 95% Confidence Interval. As a simplified approach which provides conservative results, only the two channels whose setpoints were found outside

i 4

C326-94-2022 Page 3 AS-FOUND acceptance criteria were analyzed using the regression model by combining the two sets of data in a single analysis (see Attachment 2). Accordingly, for the combined channels 2 and 7, the 95% Confidence Interval is as follows:

112.92 to 115.22% - This range exceeds the AS-FOUND criteria in the surveillance procedure but is well within the Technical Specification limit.

l NOTE:

AS FOUND Requirement -

113 to 115% Reactor Power TECHNICAL SPECIFICATION Limit -

s115.7% Reactor Power l

Thus, there exists a 95% confidence that the Technical Specification limit will not be i

exceeded.

l Also enclosed as Attachment 3 are revised Technical Specification pages in Sections 3.1 and 4.1 which were affected by License Amendment No.169. That amendment deleted the scram and isolation functions of the main steam line radiation monitor (MSLRM).

The affected pages are 3.1-5, 3.1-6, 3.1-9, 3.1-10, 3.1-13 and 4.1-4. Page 3.1-6 is revised only as a result of pagination. These changes have been reviewed and approved by the NRC staff and do not alter Technical Specification Change Request No. 218 conclusions.

A reliability assessment was performed and documented in General Electric Report NEDO-31400A, " Safety Evaluation for Eliminating The Boiling Water Reactor Main Steam Line Isolation Valve Closure Function and Scram Function of the Main Steam Line Radiation Monitor", October 1992 which addresses the effect on scram and isolation reliability of eliminating MSLRM scram and isolation functions. The assessment is documented on page 25/26 of NEDO-31400A.

Sincerely, l

l R. W. Keaten Vice President and Director Technical Functions l

l cc: Administrator, NRC Region I l

NRC Senior Resident Inspector, Oyster Creek Oyster Creek NRC Project Manager l

l l

d 4

1

FUNC110N:

APRhl NITACHMENT1 INSTRUh1ENI': APRh11-8 PROCEDURE: 620.3.003 SECilON:

TEST DATA StIEET(E2-2 UE2-5) -

DATA SCRAh! SETFOINT AS FOUND AS 1.ElT I14 +/- 1%

(113 to 115)

APRh1 APRhi DATE 1

4 2

3 5

8 6

7 1

4 2

3 5

8 6

7 4/5S3 113.5 115 112.5 113 113 113 113.5 112.5 113.5 114 113 113 113 113 113.5 113 4/12B3 114 114.5 113.5 113.5 113 113 113.5 113 114 114.5 113.5 113.5 113 113 113.5 I13 4/1963 114 114 114 114 113.5 113.5 114 113 114 114 114 114 113.5 113.5 114 113 4/26S 3 114 114 113.5 114 113.5 113.5 113.5 113 114 114 113.5 114 113.5 113.5 113.5 113 5/2/93 114 114 113.5 113 113.5 113 113 113 114 114 113.5 113 113.5 113 113 113 5/1Q93 113 114.5 113.5 113 114 113 114 114 113 114.5 113.5 113 114 113 114 114 5/1733 113 114.5 113.5 113.5 114 113.5 114 114 113 114.5 113.5 113.5 114 113.5 114 114 5/24S3 113.5 114.5 113 113.5 114 113 114 114 113.5 114.5 113 113.5 114 113 114 114 5/3163 114 114.5 114 113.5 114.5 113.5 114 114 114 114.5 114 113.5 114.5 113.5 114 114 6/7/93 114 114.5 113 113 114 113 114 113.5 114 114.5 113 113 114 113 114 113.5 6/14/93 114 114.5 113.5 113.5 114 113 114 114 114 114.5 113.5 113.5 114 113 114 114 6/2163 114 114.5 116 114 115 114.5 115 116 114 114.5 115 114 115 114.5 115 115 6/28/93 114 113.5 114 114 113.5 113.5 114 113.5 114 113.5 114 114 113.5 113.5 114 114 7/563 114 114 114 114 114 113.5 114 114 114 114 114 114 114 113.5 114 114 7/12/93 113.5 114 114 114 114 113 113 113 113.5 114 114 114 114 113 113 113 7/19/93 114 113.5 113.5 114 114 113 113.5 113.5 114 113.5 113.5 114 114 113 113.5 113.5 7/26/93 114 114 113.5 114 114

-113 113.5 113.5 114 114 113.5 114 114 113 113.5 113.5 8/1/93 114 113 114 114 114 113.5 114 114 114 114 114 114 114 113.5 114 114 8/8/93 114 113.5 114 114 114 113 113.5 114 114 113.5 114 114 114 113 113.5 114 8/12/93 113 113 8/15S3 114 114 114 113.5 114 113 114 114 114 114 114 113.5 114 113 114 114 8/22/93 114 114 113.5 113.5 113.5 113.5 114 114 114 114 113.5 113.5 113.5 113 5 114 114 OC Surveillance

i FUNC110N:

APitM ATTACIIMENT 1 INSTilUMENT: Al'ItM l-8 t

PitOCEDURE: 620.3.003 SECllON:

TESTDATA SIIEET(E2-2 E2-5)

~

L DATA SCRAM SEFIDINT AS IOUND AS LEFT I14 +/- 17c (113 to,115)

APRM APRM

+

DATE 1

4 2

3 5

8 6

7 1

4 2

3 5

8 6

7 i

8/29/93 114 114 114 114 113.5 113 114 113.5 114 114 114 114 113.5 113 114 113.5 9/5/93 114 113.5 113 113 114 113 113.5 113.5 114 113.5 113 113 114 113 113.5 113.5 9/12/93 114 113.5 113.5 114 113.5 113.5 114 114 114 113.5 113.5 114 113.5 113.5 114 114 9/26/93 115 113.5 113.5 113.5 114 113 113.5 114 114 113.5 113.5 113.5 114 113 113.5 114 I

1

. OC Surveillance eie

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l i

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ATTACHMENT 2 APRM CilANNEl. 2 & 7 COMBINID l't.OW INDUCfD SCRAM SURVEll.1ANCE DATA Ell.2&Ull 01 1 Of[

gy

=} g=='9gg-g, g

~ ' ' ~ ~ ~

- ' = = = = =

ELAPSED DATA x

y v^ = v liSTIMATED Channel 217 y ^ = a + bX x-AVOx (x-AVGx) ^ 2 y-AYGy (y-AVGy)^ 2 (s-AVGs)*

y-y^

(y-y")^2 E* "'.

5 9

S 12-Apr -95 7

113.5 in629eS79:5 - 32.679245 1067.93307 - 0.2641509 0.00977572 8.63225347 - 0.1290579 0.oi6cdwm 19-Apr-95 14 114 113.657995 - 25.679245 659.423638 0.23584905 0.05562477 - 6.0564257 0.34200471 0.11696722 26-Apr-95 21 113.5 113.686932 - 18.679245 348.914204 - 0.2641509 0.06977572 4.93414026 - 0.1869326 0.03494381 02-May-95 27 113.5 113.711736 - 12.679245 160.763260 - 0.2641509 0.06977572 3.34923460 - 0.2117361 0.M483217 10- May-95 35 113.5 113.744807 - 4.6792452 21.8953364 - 0.2641509 0.06977572 1.2 % 02705 - 0.2448073 0.05993064 17-May-95 42 113.5 113.773744 2.32075471 5.38590245 - 0.2641509 0.06977572 - 0.6130295 - 0.2737447 0.07493617 24-May-95 49 113 113.802682 9.32075471 86.8764684 - 0.7644509 0.58392666 - 7.1224635 - 0.8026820 0.64429854 31-May-95 56 114 113.831619 16.3207547 266.367034 0.23584905 0.05562477 3.84923460 0.16838054 0.02835200 07-Jun-95 63 113 113.860556 23.3207547 543.857600 - 0.7641509 0.58392666 - 17.820576 - 0.8605568 0.74055803 14-J un-95 70 113.5 113.889494 30 3207347 919.348166 - 0.2641509 0.06977572 - 8.0092559 - 0.3894941 0.15170571 21 -J un-95 77 Ito 113.91M31 37.3207547 1392.83873 2.23584905 4.99902100 83.4435742 2.08156846 4.33292726 21-Jun-95 0

115 113.600120 - 39.679245 1574.44250 1.23584905 1.52732289 - 49.037557 1.39987943 1.95 % 6243 28-J un-95 7

114 113.629057 - 32.679245 1067.93307 0.23584905 0.05562477 - 7.7073691 0.37094207 0.13759802 05-Jul-95 14 114 113.657995 - 25.6'9245 659.423638 0.23584905 0.05562477 - 6.0564257 0.34200471 0.11696722 12-Jul-95 21 114 113.686932 - 18.679245 348.914204 0.23584905 0.05562477 - 4.4054823 0.31306735 0.09801116 19-J ul-95 28 113.5 113.715870 - 11.679245 136.404770 - 0.2641509 0.06977572 3.08508M5 - 0.2158700 0.04659986 26-Jul-95 35 113.5 113.744807 - 4.6792452 21.8953364 - 0.2641509 0.06977572 1.23602705 - 0.2448073 0.05993064 l

01 - Aug-95 41 114 113.76 % 10 1.32073471 1.74439302 0.23584905 0.05562477 0.31149875 0.23038917 0.05307917 l

Ok-Aug-95 48 114 113.798548 8.32075471 69.2349590 0.23584905 0.05562477 1 96244215 0.20145181 0.04058283 15-Aug -95 55 114 113.827485 15.3207547 234.725525 0.23584905 0.05562477 3.61338554

0. t"$ 1445 0.02976123 22-Aug-95 62 113.5 113.856422 22.3207547 498.216091

- 0.2641509 0.06977572 - 5.8960484 - 0.3564229 0.12703728 29-Aug -95 60 114 113.885360 29.3207547 859.706657 0.23584905 0.05562477 6.91527233 0.11463973 0.01314226 05-Sep-95 76 113 113.914297 36.3207547 1319.19722 - 0.7641509 0.58392666 - 27.754538 - 0.9142976 0.83594015 12-Sep-95 83 113.5 113.943234 43.3207547 1876.68778 - 0.2641509 0.06977572 - 11.443218 - 0.4432349 0.19645725 26-Sep-95 97 113.5 114.001 09 57.3207547 3285.(M92

- 0.2641509 0.06977572 - 15.141331

- 0.5011097 0.25111094

(

4/5/93 0

113 113.600120 - 39 679245 1574.44250 - 0.7641509 0.58392666 30.3209327 - 0.6001205 0.%014469 l

4/12h3 7

!!3 113.629057 - 32.679245 1067.93307 - 0.7641509 0.58392666 24.9718761

- 0.6290579 0.39571387 4fl9/93 14 113 113.65 7995 - 25.679245 659.423638 - 0.7641500 0.58392666 19.6228195 - 0.6579952 0.43295779 I

4,26S3 21 113 113M6932 - 18.679245 348.914204

- 0.7641509 0.58392666 14.2737629 - 0.6869326 0.47187646 l

5,2/93 27 113 113.7117 % - 12.679245 160.763260 - 0.7641509 0.58392666 9.68885724 - 0.7117361 0.50656827 5/1093 35 114 113.744807 - 4.6792452 21.8953M4 0.23584905 0.05562477

-1.1035955 0.25519262 0.06512327 5/17/93 42 114 113.773744 2.32073471 5.38590245 0.23584905 0.05562477 0.5A734781 0.22625526 0.05119144 5/2493 49 114 113.802682 9.32075471 86.8764684 0.23584905 0.05562477 2.19829120 0.19731790 0.0389M 35 5/31/93 56 114 113.831619 16.3207547 266.367034 0.23584905 0.05562477 3.84923460 0.16838054 0.02835200 67/93 63 113.5 113.860556 23.3207547 543.857600 - 0.2641509 0.06977572 - 6.1601993 - 0.3605568 0.13000121 6/14 93 70 114 113.889494 30.3207547 919.348166 0.23584905 0.05362477 7.15112139 0.11050582 0.01221153 621S3 77 116 113.918431 37.3207547 1392.83873 2.23584905 4.99902100 83.4435742 2.08156846 4.33292726 6,21/93 0

!!5 113.600120 - 39.679245 1574.44250 1.23584905 1.52732289

-49.037557 1.39987943 1.95 % 6243 6,2893 7

113.5 113.629057 - 32.679245 1067.93307 - 0.2641509 0.06977572 8.63225347 - 0.1290579 0.01665594 6/28N3 0

114 113.600120 - 39.679245 1574.44250 0.23584905 0,05562477 - 9.3583125 0.39987943 0.15990356 7/5/93 7

114 113.629057 - 32.679245 1067.93307 0.23584905 0.05562477 - 7.7073691 0.37094207 0.13759802 7/12/93 14 113 113.657995 - 25.679245 659.423638 - 0.7641509 0.58392666 19.6228195 - 0.6579952 0.43295779 7/1943 21 113.5 ll3 M 6932 - 18.679245 348 914204 - 0.2641500 0.06077572 4,93414026 - 0.1869326 0.03494381 7126 9 3 28 113.5 113.715870 - 11.679245 1% 404770

-0.2M1509 0.06077572 3.08508365

- 0.2158700 0.04659986 8/1/93 34 114 113.740673 - 5.6792452 32.2538269 0.23584905 0 05562477

-1.3394446 0.25932653 0.06725025 8/8/93 41 114 113.76 % 10 1.32075471 1.74439.302 0.23584905 0.05562477 0.31149875 0.23038917 0.05307917 8/15N3 48 114 113.79M548 8.32075471 69.2349590 0.23584905 0.05562477 1.96244215 0.20145181 0.04058283 8/22 S 3 55 114 113.827485 15.3207547 234.725525 0.23584905 0.05562477 3.61338554 0.17251445 0.02976123 l

8.2983 62 113.5 113.856422 22.3207547 49&216091 - 0.2641509 0.06977572

~5.8960484

- 0.3564229 0.12703728 9/5/93 69 113.5 113.885 % 0 29.3207547 859.706657 - 0.2641509 OM977572 - 7.7451050 - 0.3853602 0.14850253 9/12N3 76 114 113 914297 36.3207547 1319.19722 0.23584905 0.05562477 8.56621573 0.08570237 0.00734489

=P3

.J3._. _ II4dl.3 94 3234 43.3207547 1876 M778 0.23584905 0.05562477 10.2171591 0.05676500 0.00322226 mym AVLRAGli L39 6792452J _113.764150j omemana, b__y122d STD. DEVI:

SUM (x-AVGx) ^ 2.

l[_37371.5471]

..,9.somm3gy s

  • 2(y" ) = h40516150 SUM (y-AVGy)^ 2:

21.3018867 SUM (x-AVGx)*(y-AVGy):

154.490566 SUM (y-y ^ ) ^2:

[ [ 20.6632 % ]8 SFRAPRM2 I

4 ATTACHMENT 2

~

APR,M. CllA..N. NE1 2. & 7 COMBINI.D. l'l O. W INDl:CED SCRAM SURVIJLIANCE DATA l Ell.2&f[PAGII2 OI 2 '

=

FLOW BIASED APRM SCRAM DATA 1

- CHANNEL 2 & 7 COMBINED l

Regression Output:

i h_l3.600120]

l Constant. a =

Std firrof Y Est

,_, 0 63652291 6

R Squared. r

  • 2 =

l 0.0299m m jj6

]

No.of Otmervations. N =

53 De,rees or Freedom. N-2 =

Si 5

115 i

X coerricienito b =

P~~sstE601 6

//

Std Err of Coef.

02653 5 I C

l14F hCU. IMMM 113~ W M W.- -

jbd.

wx D-E H.3-a

/'

"1--f) j D

D C

D U

112 I

I I

I 60 80 I 1bo 20 40 0

10 30 50 70 DAYS O SURVL. DATA + REGRESSION UNE avo..

39.6792452 avu.-avo.ca.

37371.5471 o VARIANCE OF ANY PREDICITD VALUE. Y(i)^.

s ^ 2(YO)* ) = s " 2(y")*{ l + (1/N) + { (AVGu -x(i))* 2 / SUM (s - AVGx)^ 2 } [

%11ERE x(i) = 3 MONT}{S + 25% = 90 dan + 22.5 days = 112.5 days 0.40516150 * [ 1 + (153) + { (33.4525301 - 112.5)^ 2 / 31035.1320 } l,

=

0.47029674

=

o Y ^ (La x(i) + 112.5 dap) = a + b

  • x(i)

Y^=

113.600120

+

02413390

  • 112.5 days 114.065185

=

CONI 1DEWCE RANGE OF Y ^ Fi 112.5 days

_N-2 =QJ.-VAllyNE-SIDEg o

=Ya pt x(i) + 112.5 dap) +/- t( ALPilA. DEGREES OFIREEDOM)* a(Y(i))

4n 1.684 114M5185

+/-

(.05.N-2)

  • a(Y(i)). FOR TWO-SIDED t. or

($ _

1671

=

t(.1 N-2)

  • s(Y(i)). FOR ONE-SIDED t. %11ERE N-2(_ $1[

L677 - BY INTERPOLATION Il4M5185

+/-

=

114M5155

+/-

1.677

  • SORT (

0.47029674 )

=

114.065185

+/-

1.15005616

=

]

f CCE_l'! ANCE CRITERI A:

112.915129 to 115.215241 A

=

I AS-FOUND: 114 +/- 1%

TECil SPEC LIMIT: < OR = 115.7%

REI ERENCES:

o STANDING ORDER #1(R.64) lo TECil SPEC PARA. 2.3 lo PROCEDURE 620 3 001 l

CONCid'S10N TIIE COMBINED CilANNELS DO NOT SA11SFY lilE 'AS-FOUND* ACCEI'IANCE CRITERIA BUT ARE NOT IN VIOLA 110N OF TLCil SPEC LIMil.

NOTES:

o SilADED NUMBERS SilM.L BECilECKED FOR ACCURACY o BOXED VAIXES ARE USED IN Till5 CALCULAT10N e.g X " 2 REPRESEN13 X-squared o

SFRAPRM2

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