ML19267A282
| ML19267A282 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 12/20/1978 |
| From: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 2-128-11, NUDOCS 7901030192 | |
| Download: ML19267A282 (8) | |
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ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK. ARKANSAS 72203 (501) 371-4422 December 20, 1978 WILLIAM CAVANAUGH lli Executive Director Generation & Construction 2-128-11 Director of Nuclear Reactor Regulation ATTN: fir. J. F. Stolz, Chief Light Water Reactors Branch #1 U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Subject:
Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 Technical Specification Change Request (File:
2-1511.1)
Gentlemen:
As committed in our letter of December 13, 1978, attached is a Technical Specification Change Request for your review and approval. This request is to change the pressurizer pressure trip setpoint of 2,1740 psia to
> 1847 psia and the low steam generator pressure setpoint of > 728 psia to 2.772 psia.
These new values are extremely conservative wTth respect to the safety analysis as the transmitter error incorporated in the set-point calculation is considerably in excess of the errors experienced in the recent qualification testing of the Rosemount transmitters. Therefore, upon completion of analyses now underway, we may request a future change to these setpoints which would represent more realistic setpoints.
In the interim, we agree to operate with the conservative values as out-lined above.
In addition, attached is a revised Figure 3.6-1 which is provided as a clarification to recent questions from your staff and I&E.
In the existing figure, only the dark lines represent boundaries with the acceptable oper-ating region being below the curves.
No limit is specified for minimum temperatures or pressures.
The modified figure presents boundaries for both temperature and pressure.
The bases for the pressure limit of 11.7 psia was provided ih response to a staff question in our letter of November 5,1976, on the subject of 790103o194
/E'/OE A PtOCLE SOUTH UTIUT ES SYSTEM
Mr. J. F. Stolz, Chief December 15, 1978 Technical Specifications. The upper boundaries (the diagonal temperature-pressure-humidity curves) essentially continue tangential, to the shown curves, to the left (e.g. lower temperatures).
Conservatively, we have shown the limits from 100F to 50F as a horizonal line. Although the upper limits between 100F and 50F are applicable to containment temperatures considerably below 50F, we chose 50F as an appropriate lower limit we rea-sonably expect not to exceed.
In accordance with 10CFR170.12, we have detennined the changes to the set-points to be a Class III amendment and have appropriately enclosed a check in the amount of $4,000.00.
The revised Figure 3.6-1 is provided in re-
.sponse to a staff request,and as the staff had access to the information presented above (meetings, letters, and telecons) before initial issuance of the AN0-2 Technical Specifications, we believe this revised figure should be incorporated to correct an oversight in the Operating License review. Accordingly, we have not enclosed a fee for incor aration of that r
figure.
Very truly your
/
e h,
L m a WilliamCavanagh,III[
m WC:JTE:ce Attachment
STATE OF AREXCSAS
}
)
SS CCUUTY OF PULASKI
)
William Cavanaugh III, bein6 duly sworn, states that he is Executive Director, Generation & Construction, for Arkansas Po er & Light Cc=pany; that he is authcrized en the part of said Ccapany to sign and file with the Nuclear Regulatory Ccmmicsion this Supplementary Information; that he has reviewed or caused to have reviewed all of the statements contained in such information, and that all such statements cade and natters set forth therein are true and ccrrect to the best of his knowledge, info ma-tion and belief.
r4%.
l A,,
-,v e -v William Ca'{a;46gh III SUBSCRIBED A'iD SWOP 3 TO before me, a Notary blic in and for the County and State above named, this J/ day of lf( h /l/h 1978.
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~t JA A L Notary Public W.commusion Epires 9/1/8L f: Co==ission Expiresi N S*TM. Fx-[-e_. g i!fpg
5
. - -TABLE 2.2-1 REACTOR PROTL'TIVE INSTRUMEilTAT10ft TRIP SETPOIflT LIMITS i;
?b U,
Fur >CTIONAL UNIT TRIP SETPOINT ALLOWABLE VA_ LUES h
1.
Ibnual Reactor Trip Not Applicable kot Applicable fi*
2.
Linear Power Level - High ro a.
Four Reactor Coolant Pumps 1 1237. of RATED THERMAL POWER
< 123.712% of RATED TllERMAL POWER Operating b.
Three Reactor Coolant Pumps Operating c.
Two Reactor Coolant Pumps Operating - Same Loop d.
Two Reactor Coolant Pumps Operating - Opposite Loops 3.
Logarithmic Power Level -
High(1) s'0.75% of RATED T!!ERMAL POWER 1 0.819% of RATED TilERMAL POWER 4.
Pressucizer Pressure - High 1 2345 psia 5 2353.887 psia 5.
Pressurizer Pressure - Low g 1847 psia (2) 2.1793.757 psia (2) 6.
Containment Pressure - High 1 18.4 psia 19.024 psia 7.
Steam Generator Pressure - Low
'2,772 psia (3) f.750.613 psia (3) 8.
Steam Generator Level - Low
> 49.4% (4) 1 48.51% (4)
%"These values left blank pending f1RC approval of ECCS analyses for operation w th less than i
four reactor coolant pumps operating.
Ifg,LE 3.3-4 B
EllGillEERED SAFETY FEATURE ACTUATION SYSTEM IriSTRUMEllTATIOri TRIP VALUES p
Q, ALLOWABLE I}
FU!lCTIO!!AL UtilT TRIP SLTP0lfli VALUES E-1.
' SAFETY INJECTI0tl (SIAS).
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- 1 a.
b.
Containment Pressure - liigh
< 18.4 psia
< 19.024 psia m
c.
-Pressurizer Pressure - Low i 1847 psia (1) 11793.757 psia (1) 2.
CONTAltlMENT SPRAY (CSAS) a.
Manual (Trip Buttons) flot Applicable flot Applicable b ~.
Containment Pressure -- liigh-liigh
< 23.3 psia
< 23.624 psia 3.
C0flTAltlMENT ISOLATI0tl (CIAS) a.
Manual (Trip Buttons) tiot Applicable Not Applicable b.
Containment Pressure - liigh
< 18.4 psia
< 19.024 psia Y
4
TABLE 3.3-4 (Cnntinuedl EtiGIllEERED SAFETY FEATURE ACTUATIO:1 SYSTEM lilSTRUliEtlTATIOil IRIP VALUES U
ALLOWABLE FUfCTI0tlAL UllIT TRIP VALUE VALUES E
4.
14Alil STEA!4 At4D FEEDWATER ISOLATI0ti (l4 SIS) a.
flanual (Trip Buttons) flot Applicable Not Applicable b.
Steam Generator Pressure - Low g 772 psia (2) q 750.613 psic (2) 5.
C0flIAlt::1EilT C00LIflG (CCAS) a.
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Containment Pressure - High 18.4 psia
< 19.024 psia c.
Pressurizer Pressure - Low
> 1847 psia (1)
> 1793.757 psia (1)
M 6.
RECIRCULATIOf1(RAS)
[
I4anual (Trip Buttons) flot Applicable flot Applicable a.
G b.
Refueling Water Tank - Low 54,400 + 2,370 gallons between 51,050 and 58,600 ir.dicated level) gallons (equivalent to (equivalent to 6.0 + 0.5%
between 5.300% and 6.886%
indicated level) 7.
LOSS OF POWER a.
4.16 kv Emergency Bus Undervoltage (Loss of Voltage) 3120 volts (4)
- 3120 volts (4) b.
460 volt Emergency Bus Undervoltage 423 + 2.0 volts 423 + 4.0 volts (Degraded Voltage) with an 8.0 4 0.5 with an 8.0 + 0.8 second time delay secend time delay
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ARKANSAS-UNIT 2 3/4 6-7