ML20132C002
Text
., -
. -.... ~
?
/ h c,#" %
UNITED STATES t
NUCLEAR REGULATORY COMMISSION f
WASHINGTON. D. C. 20555 z
\\.....*
APR 1% 1984 5
MEMORANDUM FOR: Thomas M. Novak, Assistant Director for Licensing Division of Licensing FROM:
R. Wayne Houston; Assistant Director for Reactor Safety Division of Systems Integration
SUBJECT:
ICSB REVIEW 0F PROPOSED TECHNICAL SPECIFICATION CHANGES FOR GRAND GULF - UNIT 1 Plant Name: Grand Gulf - Unit 1 Docket No.: 50-416 TAC Nos.:
53395, 54602, 54604, 54605 and 54606 Licensing Status: OL Project Manager:
D. Houston Review Branch:
ICSB Review Status: Complete By letters dated December 14, 1983, and March 29, 1984, from J. McGaughy (Mississippi Power and Light Company) to H. Denton (NRC), the licensee for Grand Gulf-Unit 1 proposed changes to the facility's technical specifica-tions. Per your request the Instrumentation and Control Systems Branch (ICSB) has reviewed proposed change designated NS-83/43 from the December 14, 1983 letter and' proposed changes numbered 2, 4 and 5 f rom the March 29, 1984 letter. Based on its review of the changes and the justifica-tion provided by the licensee,the ICSB finds that the proposed changes are acceptable. Enclosure 1 provides an evaluation of each proposed change. Enclosure 2 contains the SALP input for these evaluations in accordance with Office Letter No. 44. This completes the ICSB portion of TACS 53395, 54602, 54604, 54605 and 54606.
.}l
')
if A
W &,
~,.
Enclosures:
R. Wayne Houston, Assistant Director As stated for Reactor Safety Division of Systems Integration cc:
R. Mattson R. Capra D. Hoffman L. Kietner D. Houston
Contact:
M. Vi rgilio, ICSB X29454 f
A
% 2g$ $
lip):,
sf
. c._
ENCLOSURE 1 ICSB'S EVALUATION OF THE TECHNICAL SPECIFICATION CHANGES PROPOSED BY MISSISSIPP1 POWER & LIGHT COMPANY BY LETTERS DATED DECEMBER 14, 1983 AND MARCH 29, 1984 1.
December 14, 1983 Change NS-83/43. Technical 5pecification Table 4.3.2.1-1 pages 3/4 3-20 through 3/4 3-23a.
PROPOSED CHANGE Add footnote,c_ to items 1.a. 1.d, 2.a. 2.c, 2.d, 2.e, 3.a 3.b, 4.e, 5.a, 5.b, 5.c, 5.k, 6.c 6.d and 6.e.
This will impose a requirement that the trip units be calibrated at least once per 31 days.
Change the calibration requirements for items 2.f, 2.g, 4.c, 4.d, 4.f, 4.g, 5.d, 5.e, 5.f, 5.g, 5.1, 5.j, 6.a. and 6.b f rom once per 18 months to once per year.
i EVALUATION 1
Footnote c which states " Calibrate trip unit at least once per 31 days" is applied to certain Rosemount trip units associated with the isolation actuation instrumentation channels delineated in Table 4.3.2.1-1 of the Grand Gulf Technical Specifications. By letter dated September 9,1983, from A. Schwencer (NRC) to J. P.
f McGaughy (MP&L) the NRC staff requested that the licensee provide the rationale for calibrating certain Rosemount trip units at 18 j-month intervals and other Rosemount trip units at 31 day intervals.
In resporse to the staff's request, by letter dated October 14, 1983, i
. -. - ~ - -
---s
..w-4 from L. F. Dale (MP&L) to H. Denton (NRC), the licensee stated that the Rosemount trip unit for each channel delineated in Table 4.3.2.1-1 1
(isolation actuation instrumentation) was being calibrated monthly, 1
and changes would be proposed to the Technical Specifications to con-(
l firm this surveillance frequency.
In addition, through its review i
j of the isolation actuation instrumentation surveillance requirements, the licensee determined another case where surveillance testing was i
being performed more frequently than required by the Technical Speci-I fications. Temperature monitoring instrument channels are currently being calibrated yearly to satisfy manufacturer's recomendations.
To resolve this discrepancy and to provide Technical Specification requirements for the temperature monitoring instruments consistent with the component manufacturer's recommendations, the licensee com-mitted to propose Technical Specification changes. By letter dated Decenber 14, 1983, f rom J. McGaughy (MP&L) to H. Denton, the licen-
{
see proposed Technical Specification changes to satisfy the commit-1 j
ments contained in their October 14, 1983, letter.
Based on its review, the staff finds that the proposed Technical Speci-fication changes provide surveillance requirements consistent with
{
7 current plant practice and are in accordance with manufacturers re-i i
/
commendations. Therefore, the staff finds the proposed Technical i
/
j Specification changes acceptable, j
-m f f cc.n w %
/L
-d Pn f
g 1
.w-,-.w~.,_.,..,...,n~.
a s ---
m
- ~ ~ *
. 2.
March 29, 1983 Change #2. Technical Specification Table 3.3.7.1-1 pages 3/4 3-56 ard 3/4 3-58.
PROPOSED CHANGES Revise the minimum number of operable channels requirements and action statements for:
containnent and drywell exhaust radiation monitor instrument channels, fuel handling area ventilation exhaust radiation monitor instrument channels, and fuel handling area pool I
sweep exhaust radiation monitor instrument channels. Add note h to f
the control room ventilation radiation monitor instrument channel, i
EVALUATION The containment and drywell exhaust radiation monitoring subsystem, the fuel handling area ventilation exhau st radiation monitoring sub-system, the fuel handling area pool sump exhaust radiation monitor-ing subsystem and the control room ventilation radiation monitoring subsystem, each include four monitors, with each monitor assigned to a subsystem actuation channel. The channels are grouped in pairs and each pair makes a trip system. Both channels in one trip system I
are required to trip for the associated alann/ isolation function to occur. The issued version of the Grand Gulf-Unit 1 Technical Specifi-cations requires three monitor channels to be operable in each subsys-tem. Such requirements do not ensure a success path for the two-out-of-j two logic configuration when a single failure is postulated in one of the three required instrument channels. Accordingly, to provide Tec1-nical Specification requirements consistent with the design configuration,
~...- __. _,. _ _. _ _.
~
.- _w.
1.
.m _a 4 the licensee has proposed to revise the MINIMUM CHANNELS OPERABLE colum of Table 3.3.7.1-1 from 3 to 2/ trip systen. To provide ACTION 4
statement requirements consistent with the design the licensee has proposed to insert the phrase "in a trip system" between the words d.
" monitors" and " inoperable" in ACTION 74 and ACTION 75.
In addition, the licensee has proposed to add note "h" to iten 6, the control room ventilation radiation monitoring subsystem. This note describes the logic for system initiation and does not change the requirements of the Technical Specifications.
U sg. ] n;t h q }.
n i
Based on its review, the staff finds that e proposed changes enhance system reliability and provide a dufficiently conservative set of re-1 j
quirements should one or more channels become inoperable. Therefore, the staff finds that the proposed changes are acceptable.
y tet[s /
/1 3.
March 29, 1983
/
/
Change #4. Technical Specification Table 3.3.3-1 pages 3/4 3-25 and 3-27.
PROPOSED CHANGES j
Revise Table 3.3.3-1 to require two manual initiation switches per
.]
automatic depressurization system (ADS) trip system instead of one
--q
'{
manual initiation switch per ADS valve. Revise Table 3.3.3-1 ACTION 1
- 32 to address the ADS trip system manual initiation circuits.
I t
\\
k
= =n= **. w e w e y w.
_.---~..-.~..e, v-
~^
=a
.... l. -.-
.._t
. EVALUATION The ADS at Grand Gulf-Unit I consists of eight safety / relief valves and associated actuation instrumentation. The actuation instrumenta-tion consists of two trip systems, either of which will actuate all eight ADS valves. Each ADS trip system includes two manual hand
}
switches. Operation of both hand switches will produce an ADS trip systen actuation signal. Table 3.3.3-1 of the issued version of the Grand Gulf-Unit 1 Technical Specifications requires 1 per valve as the minimum operable channels for manual initiation. The 1 per valve re-fers to the hand switches used to actuate individual safety / relief valves, and not to the two hand switches per trip system usco to actuate the ADS trip system. Accordingly, to provide Technical Specification requirements consistent with the design configuration for ADS initia-tion, the licensee has proposed to revise the MINIMUM OPERABLE CHAN-NELS PER TRIP FUNCTION column of Table 3.3.3-1 from 1 per valve to 2 per system, and to replace the word " valve" in ACTION 32 with " trip system".
Based on its review, the staff finds that the proposed change enhances ADS reliability by placing limiting conditions for operation and sur-veillance requirements on the system level for ADS manual ir.itiation ci rcuits. Therefore, the staff finds that the proposed change is j
~
accepta ble.
u.a c e, a?
w x, ~~ a -
ewk1 s.pg 3
& 4 e p..c 7
/
-.7
- Lw.
- a..- -
.. - -..... ~. -.
. 4.
March 29, 1983 Change #5. Technical Specification 4.3.7.8 page 3/4 3-75.
PROPOSED CHANGE Revise the channel calibration frequency of the chlorine detection systam from at least once per 18 months to at least once per 6 months.
EVALUATION The licensee has proposed a more frequent channel calibration for the chlorine detection systen consistent with the recommendations of the detector manufacturer.
Based on its review, the staff finds that the proposed change provides for surveillance requirements that are consistent with manufacturers recommendations. Therefore, the staff finds that the proposed change is acceptable, f
(
h S
6 & lar l pg
. ~..
w.......
7-5.
March 29, 1984 Change #3. Plant Systems Actuation Instrumentation, Technical Specification 3.3.8 and Table 3.3.8-1, pages 3/4 3-96 through 3/4 3-98a.
PROPOSED CHANGES (1) Revise Technical Specification Action Statement 3.3.8.a to require that an instrument channel be declared inoperable, with action taken as specified in Table 3.3.8-1, when its set-point is found to be nonconservative.
(2) Revise Technical Specification Action Statement 3.3.8.b to require that with inoperable instrument channels action be taken in accordance with Table 3.3.8-1.
(3) Revise Technical Specification Action Statement 3.3.8.c to transfer its requirenents to Table 3.3.8-1.
(4) Revise Technical Specification Table 3.3.8-1 to require two operable drywell pressure-high and two operable reactor vessel water level low instrument channels for each contain-ment spray trip system. Revise Table 3.3.8-1 to reference the appropriate Action Statements.
~
-...,9%
.,_n
, - e.~
" abs..,..s.....
j J.-
4.
,iw..
+.1
.i I
4" 4..
p i
4-8-
EVALUATION The Grand Gulf design includes two containment spray systems (A&B).
)
Each containment spray system is initiated by its associated instrument i
trip system. Each trip system consists of the following channels:
1.
two drywell pressure-high, 2.
two containment pressure-high, i
3.
two reactor vessel water level - low (level.)
i 4.
one ten minute timer (System B has an additional timer
)
to provide a delay of up to 90 seconds).
Upon sensing a LOCA condition via the drywell pressure-high and/or vessel water level low instrumentation,the spray actuation instrumentation starts its timers.
If at the end of the timer cycle ( 10 minutes) a containment high pressure signal exists, the low pressure coolant injection system A flow will be automatically diverted from an injection to spray function.
Ninety seconds later, at the end of its timers cycles, low pressure coolant injection system B flow will be automatically diverted to spray provided a containment high pressure condition is sensed.
One proposed change to Table 3.3.8-1 increases the minimum number of re-quired operable channels from one per trip system to two per trip system for the drywell pressure-high and the reactor vessel low-level 1 instru-
- ments. This change is necessary so that a suf ficient number of channels will be operable to ensure a success path for the mixed one-out-of-two-taken-twice logic.
1
)
u-9-
Changes to the Action Statements in Technical Specification 3.3.8 are proposed to better reflect the system design. In the issued version of the Grand Gulf Technical Specifications, Action Statements a and b.1 require that inoperable timers be placed in the tripped condition.
Placing a timer in the tripped condition could result in premature di-version of low pressure coolant injection flow. A more appropriate Action is proposed to declare the associated trip system inoperable when a timer is inoperable.
In the issued version of the Grand Gulf Technical Specifications, Action Statement 2.b indicated that there are two, rather than one, trip system for each spray system. Corrections to indicate the number of trip systems are proposed, and appear in Action 130b on Table 3.3.8-1.
Other changes that are administrative in nature are proposed to reformat the required actions when instrument channels are detennined to be inoperable.
Based on its review, the staff finds that the proposed changes enhance systen reliability and provide a sufficiently conservative set of require-s should one or more channels bec e inoperable. Therefore, the
~
staff finds that the proposed chang are acceptable.
7 wh L M
& rp%
7 ay Gc, 7
fjpA D5
?
ri4 A ?
.m.~.
_ m % w, - -
-m..-
_,m.
A ENCLUSUMt r
~
ICSB SALP IHPUT PLANT: GRAND GULF - UNIT 1
SUBJECT:
REGARDING TACS 53395, 54602, 54604, 54605 AND 54606 EVALUATION PERF0IUtANCE BASIS CRITERIA CATEGORY t
1.
a"jm"et N/A No basis for assessment.
no
^
A clear understanding of the issues was demonstrated. A technically sound 1
2.
Approach to and thorough approach was used to justify each proposed technical specification Resolution of l'
change.
Technical Issues
[
t i.
i:
3.
Responsiveness N/A No basis for assessment.
1 4.
Enforcement History N/A No basis for assessment.
5.
Reportable Events N/A No basis for assessment.
i 6.
Staffing N/A No basis for assessment.
~
N/A No basis for assessment.
- 7. Tni@
1i
'!i!
.