ML20028G367

Proposed Tech Specs to License DPR-33,allowing Operation W/Increased Core Flow for Remainder of Current Operating Cycle

ML20028G367
Person / Time
Site:	Browns Ferry
Issue date:	02/01/1983
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20028G366	List: ML20028G364 ML20028G367 ML20028G368
References
NUDOCS 8302090004
Download: ML20028G367 (5)

Text

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23 4 TABLE 3.2.C INS 1110MEf7ATION TGAT INITI ATES 900 S!KKS minisaa eks. .,

operante ter Trif* Sr W R runct ion T0 0 te'81 Se HlDG 2 (18 Aritx Upecale (Flow Stae) f0.66 Wee 25 (2) 2 (1) APpx opscale (s tartup pl ( 8) 1 125 i

2(l) AFSM Downscale (1) h 38 .

1 2(1) APSM Inoperative (10b) e 167) RSM Opacale (rlow Stae) f,0.66W*405 (23 ( 1 3 )

1 (7) 3B4 Downscale (9) 3 JS 1(7) 384 Inogerative (10c) 3 (1) ism Opacale (8) 5 108/125 of fall scale i u E 5/125 of full scale

u 3 (1) IBM D wnscale (3) (8) l 3(1) IRM Detector not in Startup Position (6) (11) ,

1 3 (1) DM Inoperative (9) (10a3 2 (1) (5) can opacale (8) d 1 s 10 c ount e e s e e .

2 (1) (6) sa H Downsc a le (e) (G) 1 3 counta/sec.

2 (1) (6) SRM Detector not in Startup roottlon (t) (8) (11) 2 (1) (6) osus Inoperative (0) (10 )

2(i) riow stae comparator $ 105 dif f ereace in recirculation flows i 2(in rion stas op.cate 5,115% recirculation flow ,

904 Block logic tt/A I 1(1)

SSCS R estraint 147 pe19 terbine 2 (1) first-etage pressore (PS-45-61A and Ps-45-618) 1(12) Scram Discharge Tank 11ater 125 gal.

Level liigh

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8. This function is bypnased when the roda evitch is placed to lun.

9. This function 13 only activo when the eodo evit ch is in tun. This function td autorest ically bypas sed when the (F11 instrumancation is operable and not h t r.h .

10. The inoperattve trips are produced by the following functions:

a. SRM and IRM (1) Loca l "op e r a t e -c a l ib r a t e'* swi t c h no t in operata.

(2) Pcwg r s u p p l y vol t a g e lov.

(3) Circuit boards not in circuit,

b. APRM (1) Local " operate-calibrate" svitch not in opersts.

(2) te s e tttan l e LPR11 inpu t a .

(3) Circui: boards rot in circuit.

c. aBH (1) Local " operate-calibrate" switch not in operate.

(2) Circuit boards not in circuit.

O) asM fails to null.

(4) 1.e e s than required number of LPRM inputs for rod selected.

11. Detector traverse is adjusted to 11f. I 2 f.nches, placing the detector lower ponttion 24 inches below the lower core plate.

If this

12. This function may be bypassed in the shutdewn or refuel mode.

function is inoperable at a time when operability is required the channel chall be tripped or administrative controla shall he immediately imposed l

i to prevent control rod withdrawal.

13. RBM upscale flow biased setpoint clipped at 106% rated reactor power.

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l 3 I I i 1 l l l l 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Figure 3.5.K-1 MCPR LIMITS *

• NOTE: Lead test assemblies are categorized as P8x8R bundles.

172b W

BROWNS FE..F.Y NUCLE AR PL ANT i

FIGURE 3.5.2

' K gFACTOR i

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o AUTOMATIC F LOW CONTROL l2 Kg l

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__M ANU AL FLOW CONTROL Tube Scoegtion Set-Point such that Calibration posi Flowmax = let.s %

l.0 - 112.0 %d ,

117.0 % -

t I t I f f.

t 90 10 0

• 60 70 80 30 40 50 CCRE Ft.OW,% ,

• K g = 1.0 for core flow > 100%.

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ENCLOSURE 2 DESCRIPTION AND JUSTIFICATION The proposed revisions are needed to allow operation of unit 1 at increased core flow. NED0-22135 is a safety evaluation performed by General Electric Company to show that Browns Ferry unit 1 can safely operate in a condition of increased flow. The limiting abnormal operational transients for rated flow operation end the loss of coolant accident, rod drop accident, and rod withdrawal error events were reanalyzed for increased core flow operation. This safety evaluation showed that the MCPR operating limits increased by a slight margin. The graph on page 172b of the technical specifications is revised to reflect this.

The report also specified the following operational conditions as being necessary to facilitate increased core flow operation.

The rod block monitor upscale (flow biased) must be " clipped" at 106-percent power in order to ensure adequate protection in-the event of a rod withdrawal error. A note on page 75 is being added to reflect this. On page 73, the rod block on recirculation flow is being increased from 110 percent to 115 percent to ensure operational flexibility. A note is being added to table 3 5.2 on page 173 to reflect that the Kr factor is equal to 1.0 for core flows greater than or equal to rated core flow.

All other operating limits previously established for the cycle 5 reload licensing bases have been shown in NEDO-22135, attached, to be bounding.

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